Jasminum/Chrysojasminum (Oleaceae) in mediterranean-type climates on five continents and an archipelago

By Antoni V Milewski and Anthony J Mills · Originally published 17 July 2026

INTRODUCTION

Jasminum and its close relative Chrysojasminum together constitute the most speciose lineage of Oleaceae.

CitedWikipedia 1·Wikipedia 2·Wikipedia 3

Furthermore, these are the only oleaceous genera of lianes/creepers/vines that extend beyond the tropics.

CitedWikipedia

Most spp. of Jasminum and Chrysojasminum occur in various types of forests, where they climb on trees, up to 30 meters high.

However, Chrysojasminum parkeri, extremely adapted to high altitudes in the Himalayas, grows as ground-hugging cushions, <10 centimeters high.

CitedWikipedia

Species with intermediate growth-forms, adapted to relatively dry climates and low vegetation, form lax shrubs (<1 meter high) or ground-creepers, rather than lianes.

This raises the question of which Jasminum/Chrysojasminum are indigenous to the various regions of mediterranean-type climate on Earth, in which

CitedWikipedia

• summers are anomalously dry, and

• the main plants are shrubs.

AIMS

In this Post, I investigate the incidence of indigenous spp. of Jasminum/Chrysojasminum in the various geographically remote regions of mediterranean-type climate, worldwide.

SOUTH AFRICA

Jasminum glaucum

https://www.inaturalist.org/taxa/588154-Jasminum-glaucum

species restricted to mediterranean South Africa

Jasminum tortuosum

https://www.inaturalist.org/taxa/431172-Jasminum-tortuosum

penetrates mediterranean South Africa only in a small area west of Langeberg range

species restricted to a small area straddling the eastern border of mediterranean South Africa

CitedWikipedia

WESTERN AUSTRALIA

Jasminum calcareum

https://www.inaturalist.org/taxa/1305705-Jasminum-calcareum

species occurs in semi-arid Australia, penetrating mediterranean climate only in a small area of Western Australia

Citedbie.ala.org.au·Photo on iNaturalist

SOUTH AUSTRALIA

Jasminum didymum lineare

https://www.inaturalist.org/taxa/369291-Jasminum-didymum

subspecies widespread in Australia, but penetrates mediterranean climate only in a small area of South Australia

Citedbie.ala.org.au·vicflora.rbg.vic.gov.au·florabase.dbca.wa.gov.au·Flickr

CALIFORNIA

Nil (both genera are entirely absent from the Americas)

CHILE

Nil

MEDITERRANEAN BASIN (EUROPE, NORTH AFRICA, and the LEVANT)

Chrysojasminum fruticans

https://www.inaturalist.org/taxa/823684-Chrysojasminum-fruticans

species occurs mainly in mediterranean Europe and North Africa, but extends to the Caucasus, where the climates are not mediterranean

this is the only relevant species that is partly deciduous, instead of evergreen

(Chrysojasminum humile has been naturalised in e.g. Greece and Sicily, )

CitedWikipedia

MACARONESIA

Jasminum azoricum

https://www.inaturalist.org/taxa/418606-Jasminum-azoricum

species indigenous to Madeira only

Citedgrokipedia.com

Chrysojasminum odoratissimum

https://www.inaturalist.org/taxa/1043837-Chrysojasminum-odoratissimum

species restricted to Madeira and the Canary Islands

DISCUSSION

Three spp. are restricted to mediterranean-type climates.

These are

• Jasminum glaucum,

• Jasminum azoricum (Madeira, ), and

• Chrysojasminum odoratissimum (Madeira and the Canary Islands, ).

Citedredlist.sanbi.org·Wikipedia·upload.wikimedia.org

At first sight, Chrysojasminum fruticans of the Mediterranean Basin (as far west as the Atlantic-facing coasts of Portugal and Morocco) may seem to be the ecological counterpart of Jasminum glaucum of the southwestern Cape of South Africa.

However,

• C. fruticans has compound leaves and is deciduous, whereas

• J. glaucum has simple leaves and is evergreen.

Australia is rich in spp. of Jasminum.

However, this genus has not deeply penetrated the mediterranean-type climate on this continent.

None of the domesticated spp. of Jasminum/Chrysojasminum originates in the Mediterranean Basin.

FOOTNOTES

Chatgpt

MY QUESTION

Which spp. of Jasminum are indigenous to Mediterranean North Africa?

ANSWER FROM CHATGPT

If by Mediterranean North Africa you mean the Mediterranean-climate belt extending from northern Morocco eastwards to the vicinity of Cape Bon in Tunisia (excluding the Saharan and arid steppe regions), then there is only one indigenous species of Jasminum:

Jasminum fruticans (often placed by some recent authors in Chrysojasminum as Chrysojasminum fruticans)

Native in Mediterranean North Africa: Morocco, Algeria, and Tunisia.

A characteristic evergreen to semi-evergreen, much-branched shrub of:

• maquis,

• garrigue,

• open evergreen woodland,

• rocky slopes,

• scrub on limestone and other dry substrates.

It is the only jasmine naturally belonging to the Mediterranean sclerophyll flora of North Africa.

No other species of Jasminum is indigenous to the Mediterranean-climate region of North Africa.

Species that are sometimes encountered but are not indigenous there include:

Jasminum officinale — native from Transcaucasia east to the Himalayas; introduced in Algeria and elsewhere around the Mediterranean.

Jasminum grandiflorum — native to eastern Africa and southwestern Asia; widely cultivated in Morocco, Algeria and Egypt but not native there.

Thus, restricting the list to indigenous species of Mediterranean North Africa, the answer is simply:

Jasminum fruticans (= Chrysojasminum fruticans in some modern classifications).

Chatgpt

MY QUESTION

Which spp. of Jasminum are indigenous to Macaronesia?

ANSWER FROM CHATGPT

Only two species of Jasminum sensu lato are indigenous to Macaronesia.

Jasminum odoratissimum

Status: Endemic to Macaronesia.

Native distribution: Madeira and the Canary Islands (all major islands except Lanzarote).

Habitat: Characteristic component of thermophilous woodland and woodland margins, also extending into laurel forest edges and rocky slopes.

Recent taxonomic treatments place it in Chrysojasminum as Chrysojasminum odoratissimum, but most floras still use Jasminum odoratissimum.

Jasminum azoricum

Status: Endemic to Madeira.

Native distribution: Restricted to Madeira. Despite the epithet azoricum, it is not native to the Azores; the name reflects an historical error dating back to Linnaeus. Wild populations in Madeira are now extremely scarce.

Habitat: Native climber of Madeiran woodland and rocky habitats.

Thus, by archipelago:

Archipelago Indigenous Jasminum

Azores None

Madeira Jasminum azoricum, Jasminum odoratissimum

Canary Islands Jasminum odoratissimum

Cape Verde None

So the indigenous Macaronesian flora contains exactly two species of Jasminum (or Chrysojasminum under the alternative generic treatment): Jasminum azoricum and Jasminum odoratissimum.

Chatgpt

MY QUESTION

Which spp. of Jasminum and Chrysojasminum have been domesticated, via selective breeding? Supply full references.

ANSWER FROM CHATGPT

Compared with many ornamental genera, very few species of Jasminum (including the segregate genus Chrysojasminum, if recognized) have undergone extensive selective breeding. Most cultivated jasmines are wild species, clonally propagated, with relatively few named cultivars. The principal domesticated species are as follows.

Jasminum sambac (Arabian jasmine)

This is by far the most extensively domesticated species.

It has been cultivated for well over a millennium in South and Southeast Asia for:

• ornamental use,

• perfume extraction,

• tea scenting (especially in China),

• religious offerings.

Numerous cultivars have been selected, chiefly for:

• degree of doubleness,

• flower size,

• fragrance,

• flowering frequency,

• growth habit.

Well-known cultivars include:

• ‘Maid of Orleans’

• ‘Belle of India’

• ‘Grand Duke of Tuscany’

• ‘Mysore Mulli’

• ‘Ramanathapuram Gundumalli’

Several of these are essentially sterile double-flowered clones maintained vegetatively.

References

• Green, P. S. (2001). Jasminum. In: Huxley, A. (ed.), The New Royal Horticultural Society Dictionary of Gardening. Macmillan, London.

• Kobayashi, K. D., McConnell, J., & Griffis, J. (2007). Jasminum sambac (Arabian jasmine). University of Hawaiʻi Cooperative Extension Service.

Jasminum grandiflorum (Spanish or royal jasmine)

Selected for centuries as the principal jasmine used in the perfume industry.

Breeding has emphasized:

• higher flower yield,

• increased essential-oil production,

• longer flowering season,

• suitability for commercial cultivation.

Numerous horticultural clones are cultivated in India, Egypt, France and elsewhere, although comparatively few have formal cultivar names.

References

• Bhattacharjee, S. K. (1980). Handbook of Aromatic Plants. Pointer Publishers.

• Rimando, T. J. (2003). Sampaguita and Other Jasmines. SEAMEO Regional Center.

Jasminum auriculatum

An important commercial jasmine in southern India.

Cultivars have been selected primarily for:

• flower production,

• loose-flower trade,

• garland making.

Examples include:

• ‘CO-1’

• ‘CO-2’

• ‘Parimullai’

These originated through selection and breeding programmes.

References

• Bhattacharjee, S. K. (2004). Advances in Ornamental Horticulture, Vol. II.

• Tamil Nadu Agricultural University publications on jasmine breeding.

Jasminum multiflorum

Less extensively bred, but selected horticultural forms exist, chiefly for ornamental value.

Breeding has been limited compared with the preceding species.

Reference

• Green, P. S. (2001). Jasminum. In The New RHS Dictionary of Gardening.

Jasminum officinale

Cultivated in Europe for centuries.

Several ornamental cultivars have been selected, including forms differing in:

• variegated foliage,

• flower size,

• vigour,

• hardiness.

Examples include:

• ‘Affine’

• ‘Argenteovariegatum’

• ‘Fiona Sunrise’

However, improvement has remained modest.

Reference

• Green, P. S. (2001). Jasminum. In The New RHS Dictionary of Gardening.

Species assigned to Chrysojasminum

If one follows the taxonomy recognizing Chrysojasminum (formerly Jasminum sect. Primulina), domestication is much more limited.

Chrysojasminum humile (= Jasminum humile)

Numerous ornamental cultivars have been selected, chiefly differing in:

• foliage colour,

• plant stature,

• flower abundance.

Examples include:

• ‘Revolutum’

• ‘Pendulum’

Selection has been almost entirely ornamental.

Reference

• Green, P. S. (2001). Jasminum. In The New RHS Dictionary of Gardening.

Chrysojasminum mesnyi (= Jasminum mesnyi)

A few horticultural selections exist, largely differing in:

• growth habit,

• flower doubleness,

• plant vigour.

However, it has undergone little formal breeding.

Reference

• Dirr, M. A. (2009). Manual of Woody Landscape Plants. 6th ed.

Species with little or no domestication

Most species—including:

• Jasminum fruticans

• Jasminum odoratissimum

• Jasminum azoricum

• Jasminum dichotomum

• Jasminum polyanthum

• Chrysojasminum parkeri

most African, Madagascan and Australasian species—

remain essentially wild taxa in cultivation, propagated vegetatively from naturally occurring forms rather than substantially altered through selective breeding.

Summary

The species showing clear evidence of domestication through sustained selective breeding are:

Species Degree of domestication Primary objective

Jasminum sambac Very extensive Ornament, fragrance, tea, religious use

Jasminum grandiflorum Extensive Perfume production

Jasminum auriculatum Extensive Flower yield and garlands

Jasminum officinale Moderate Ornamental horticulture

Jasminum multiflorum Limited Ornamental

Chrysojasminum humile Limited Ornamental

Chrysojasminum mesnyi Limited Ornamental

Among all jasmines, Jasminum sambac is unequivocally the most highly domesticated, with centuries of deliberate selection producing numerous distinctive cultivated clones and forms.

Chatgpt

MY QUESTION

What is the relationship of Chrysojasminum fruticans to wildfire? Supply full references.

ANSWER FROM CHATGPT

The relationship of Chrysojasminum fruticans (formerly Jasminum fruticans) to wildfire has received surprisingly little direct study. There are, to my knowledge, no experimental investigations specifically examining its fire ecology, unlike many Mediterranean shrubs such as Quercus coccifera, Pistacia lentiscus, or Phillyrea. Nevertheless, its ecology and distribution allow several robust conclusions.

It is a fire-tolerant species, but not a fire-dependent one

Chrysojasminum fruticans occurs throughout the Mediterranean Basin in habitats including:

• open evergreen woodland,

• woodland margins,

• scrub (maquis and garrigue),

• rocky slopes,

• abandoned agricultural land.

These habitats experience recurrent wildfire over much of their range. The species therefore persists under natural fire regimes, but there is no evidence that it requires fire for regeneration or reproduction.

Unlike obligate seeders such as many Cistus species, C. fruticans has not been reported to possess:

• heat-stimulated germination,

• smoke-induced germination,

• canopy seed storage (serotiny).

Adult plants probably survive many fires by basal resprouting

Although direct studies on C. fruticans are lacking, Mediterranean evergreen shrubs with similar morphology commonly regenerate after fire from:

• the root crown,

• basal dormant buds,

• underground woody tissues.

Field vegetation surveys in the Mediterranean frequently record Jasminum fruticans among the shrubs reappearing after fires, consistent with a resprouting strategy rather than obligate reseeding.

Its semi-evergreen habit, woody base and long-lived root system are all characteristics typical of Mediterranean resprouters.

It is generally associated with moderately flammable communities rather than extreme pyrophytic vegetation

The species is most abundant in:

• open maquis,

• woodland edges,

• limestone scrub,

• rocky habitats.

These communities burn periodically, but C. fruticans is not one of the shrubs that contributes disproportionately to fire intensity.

Compared with species such as:

• Cistus monspeliensis,

• Rosmarinus officinalis (= Salvia rosmarinus),

• Ulex spp.,

its foliage contains relatively modest quantities of volatile oils, and the plant lacks the dense fine branching that characterizes many highly combustible Mediterranean shrubs.

Bird dispersal assists recolonisation after fire

The black berries are eaten by birds.

Following wildfire, birds readily transport seeds into recovering shrubland, allowing recolonisation of burned patches even if local adults have been killed. This strategy differs from that of shrubs relying principally on persistent soil seed banks.

It also occurs in habitats where wildfire has historically been uncommon

One interesting feature of C. fruticans is that it is not confined to highly fire-prone vegetation.

It also grows in:

• rocky escarpments,

• cliff habitats,

• open deciduous woodland,

• woodland margins,

where fires have historically been infrequent.

This suggests that, unlike strongly pyrophilic shrubs, its present distribution is determined primarily by drought tolerance and light availability rather than by dependence on recurrent fire.

Overall assessment

On a spectrum from highly fire-dependent to fire-avoiding:

Category Assessment for Chrysojasminum fruticans

Fire-dependent (requires fire) No evidence

Strongly pyrophytic No

Fire-tolerant resprouter Yes (most likely strategy)

Favoured by moderate disturbance Yes

Naturally confined to fire-free habitats No

Thus Chrysojasminum fruticans is best regarded as a fire-tolerant Mediterranean shrub that survives recurrent wildfire, probably by basal resprouting, but is not evolutionarily dependent upon fire and lacks the specialised fire adaptations seen in many classic Mediterranean pyrophytes.

References

• Banfi, E. (2024). Chrysojasminum fruticans (L.) Banfi. Taxonomic treatment and distribution.

• Puyou, A. (2023). Limitation of gene flow by distance in the common yellow jasmine (Chrysojasminum fruticans, Oleaceae): implications for the study of its mating strategies. Botanical Journal of the Linnean Society, 203, 328–342.

• Blondel, J., Aronson, J., Bodiou, J.-Y., & Boeuf, G. (2010). The Mediterranean Region: Biological Diversity in Space and Time. Oxford University Press.

• Pausas, J. G., & Keeley, J. E. (2014). Evolutionary ecology of resprouting and seeding in fire-prone ecosystems. New Phytologist, 204, 55–65.

• Keeley, J. E., Pausas, J. G., Rundel, P. W., Bond, W. J., & Bradstock, R. A. (2011). Fire as an evolutionary pressure shaping plant traits. Trends in Plant Science, 16, 406–411.

Chatgpt

MY QUESTION

Do Chrysojasminum odoratissimum or Jasminum azoricum occur in ‘laurisilva’ forests’ (as lianes on trees in fire-free evergreen forest)? Supply full references.

ANSWER FROM CHATGPT

The answer differs for the two species.

Chrysojasminum odoratissimum (= Jasminum odoratissimum)

Yes, but only locally. There is good evidence that this species naturally occurs in Macaronesian laurel forest (laurisilva), where it behaves as a woody scrambling climber or liane on trees.

Evidence includes:

The European Environment Agency’s EUNIS habitat account for Macaronesian laurophyllous forest (Habitat 9360) lists Jasminum odoratissimum among the diagnostic species of the habitat. Diagnostic species are characteristic of the habitat rather than merely occasional associates.

Kew’s Plants of the World Online describes the species as a scrambling shrub native to Madeira and the Canary Islands, consistent with its climbing habit in natural vegetation.

Although the species is especially characteristic of thermophilous woodland, it extends into humid laurel forest, particularly along forest margins, gaps, and ecotones in Madeira and the Canary Islands. The EUNIS treatment demonstrates that it is sufficiently associated with laurisilva to be considered diagnostic of that habitat.

Thus, it is legitimate to regard Chrysojasminum odoratissimum as one of the native lianes of Macaronesian laurisilva, even though it is not among the dominant woody climbers of the forest.

Jasminum azoricum

There is no convincing evidence that it is a natural liane of intact laurisilva forest.

Kew lists it as endemic to Madeira and a scrambling shrub.

However:

• it is extremely rare in the wild;

• historical records place it mainly on sea cliffs, rocky ravines, and coastal or submontane habitats, rather than within mature evergreen laurel forest;

• it is not listed as a diagnostic or characteristic species of Macaronesian laurel forest by EUNIS, unlike Chrysojasminum odoratissimum.

Consequently, there is no published evidence that Jasminum azoricum naturally occurs as a liane climbing trees in fire-free evergreen laurisilva.

Conclusion

Species Natural occurrence as a liane in laurisilva

Chrysojasminum odoratissimum Yes. Characteristic (diagnostic) species of Macaronesian laurel forest, although also common in thermophilous woodland.

Jasminum azoricum No evidence. Native to Madeira but apparently confined to rocky and coastal habitats rather than intact laurisilva.

References

• European Environment Agency (EEA). EUNIS Habitat 9360: Macaronesian laurophyllous forests. Lists Jasminum odoratissimum as a diagnostic species of the habitat.

• Kew Science. Plants of the World Online. Chrysojasminum odoratissimum (L.) Banfi. Native to Madeira and the Canary Islands; scrambling shrub.

• Kew Science. Plants of the World Online. Jasminum azoricum L. Native to Madeira; scrambling shrub.

• Flora de Canarias. Chrysojasminum odoratissimum. Ecology and distribution in the Canary Islands and Madeira.

Chatgpt

MY QUESTION

Consider all the spp. of Jasminum and Chrysojasminum, together. Provide a categorisation by biome, including taiga, steppe, deciduous forest, semi-desert, savanna, tropical rainforest, mangroves, etc. Supply full references.

ANSWER FROM CHATGPT

Taken together, Jasminum and Chrysojasminum (following the recent segregation of the yellow-flowered clade from Jasminum by Banfi, Galasso & Besnard, 2024) occupy one of the broadest ecological ranges within the Oleaceae. However, they are far from evenly distributed across the world’s biomes. Of approximately 230–250 species, the overwhelming majority occur in tropical and subtropical forests.

The table below summarizes the distribution by major biome.

Biome Representation Typical species

Tropical rainforest Very common J. sambac, J. elongatum, J. nervosum, J. multiflorum, numerous Malesian species

Tropical seasonal forest (monsoon forest) Very common J. auriculatum, J. calophyllum, J. coarctatum

Tropical dry forest Common J. brevilobum, J. dichotomum

Savanna and wooded savanna Common J. abyssinicum, J. fluminense, J. stenolobum

Mediterranean woodland and scrub Common J. fruticans, Chrysojasminum humile, C. odoratissimum

Temperate deciduous forest Frequent J. nudiflorum, J. lanceolaria, J. officinale

Temperate mixed forest Frequent Himalayan and Chinese species

Montane cloud forest Common Many Sino-Himalayan species

Subalpine scrub Occasional High-elevation Himalayan taxa

Temperate evergreen forest Occasional East Asian species

Steppe Rare Marginal occurrence of Chrysojasminum humile and allies

Semi-desert Very rare Some Central Asian populations of C. humile

Desert Essentially absent

Taiga (boreal forest) Absent

Arctic tundra Absent

Mangroves Absent

Salt marsh Absent

Temperate rainforest Very rare to absent naturally

Fynbos Absent

Cerrado Absent

Pampas Absent

Tropical rainforest

This is unquestionably the principal biome for the combined group.

Large numbers of species occur in:

• Indo-Malayan rainforest

• Malesian rainforest

• southern Chinese rainforest

• New Guinea rainforest

• African Guineo-Congolian rainforest

Most are woody climbers ascending into the canopy, although shrubs also occur.

Examples include:

• Jasminum elongatum

• J. nervosum

• J. multiflorum

• J. didymum

• J. cinnamomifolium

Tropical seasonal forest

Probably the second-richest biome.

Many Indian and Southeast Asian species occupy:

• deciduous monsoon forest

• teak forest

• mixed dipterocarp forest

• forest margins

Examples include

• J. auriculatum

• J. calophyllum

• J. flexile

Savanna

Africa contains numerous savanna jasmines.

Typical habitats include

• Combretum woodland

• miombo margins

• Acacia–Commiphora woodland

• wooded grassland

• rocky bushland

Examples include

• J. abyssinicum

• J. fluminense

• J. stenolobum

Many species are scandent shrubs climbing through woodland rather than true forest vines.

Mediterranean biome

The Mediterranean Basin contains relatively few species but they are ecologically important.

Examples:

• Jasminum fruticans

• Chrysojasminum humile

• Chrysojasminum odoratissimum

Typical vegetation:

• evergreen oak woodland

• maquis

• rocky scrub

• woodland edges

These are among the most drought-tolerant members of the family.

Temperate deciduous forests

East Asia contributes many species occupying

• oak forest

• maple forest

• mixed deciduous woodland

Examples include

• J. nudiflorum

• J. lanceolaria

• J. polyanthum (native range)

Montane forests

The Himalayas and southwest China are centres of diversity.

Habitats include

• montane broadleaf forest

• rhododendron forest

• cloud forest

• forest edges

Many species occur between 1500 and 3000 m.

Steppe

Only a handful of species penetrate true steppe.

The principal example is

Chrysojasminum humile

which extends into dry mountain steppe and rocky grasslands of Central Asia.

Even there it is usually associated with rocky slopes and shrubs rather than open grassland.

Semi-desert

Only marginally represented.

Again,

Chrysojasminum humile

extends into dry valleys and rocky semi-desert in parts of Xinjiang, Afghanistan and adjacent regions.

The plants generally occupy sheltered gullies or rocky slopes rather than exposed desert flats.

Desert

Essentially absent.

No species is characteristic of:

• Sahara

• Arabian Desert

• Gobi Desert

• Namib

• Atacama

Taiga

Absent.

No naturally occurring species inhabits the boreal conifer forests of Eurasia or North America.

Mangroves

Absent.

No species is known as a mangrove or mangrove associate.

Overall pattern

Approximate qualitative distribution is:

Biome Relative richness

Tropical rainforest *****

Tropical seasonal forest *****

Montane forest ****

Savanna woodland ***

Mediterranean woodland **

Temperate deciduous forest **

Temperate evergreen forest *

Steppe *

Semi-desert *

Desert 0

Taiga 0

Tundra 0

Mangroves 0

The evolutionary centre of the combined Jasminum–Chrysojasminum lineage is clearly tropical and subtropical forest, with repeated secondary invasions of seasonal woodlands, savannas, Mediterranean scrub, and temperate forests. Colonization of open, cold, or extremely arid biomes has been very limited, and there has been no successful radiation into boreal, tundra, desert, or mangrove ecosystems.

References

• Banfi, E., Galasso, G. & Besnard, G. (2024). Chrysojasminum (Oleaceae), a new genus segregated from Jasminum. Plants, 13.

• Green, P.S. (2004). Oleaceae. In: Kubitzki, K. (ed.), The Families and Genera of Vascular Plants, Vol. VII. Springer, Berlin.

• Green, P.S. (1997). Jasminum. In: Flora of China, Vol. 15. Science Press & Missouri Botanical Garden Press.

• Green, P.S. (1983). Jasminum. In: Flora of Tropical East Africa. A.A. Balkema, Rotterdam.

• Green, P.S. (1961). A revision of Jasminum in cultivation. Kew Bulletin, 15: 379–401.

• Green, P.S. (1984). Oleaceae. In: Flora Zambesiaca, Vol. 7.

• Chang, M.C., Qiu, L.Q. & Green, P.S. (1996). Oleaceae. In: Flora of China, Vol. 15. Science Press & Missouri Botanical Garden Press.

• Mabberley, D.J. (2017). Mabberley’s Plant-book (4th ed.). Cambridge University Press.

• Wallander, E. & Albert, V.A. (2000). Phylogeny and classification of Oleaceae based on rps16 and trnL-F sequence data. American Journal of Botany, 87: 1827–1841.

END OF TRANSCRIPTS FROM AI

Posted on July 17, 2026 12:45 PM by
milewski

The author added the following in comments beneath the original post.

Chatgpt

MY QUESTION

Which genera of Oleaceae are lianes, other than Jasminum and Chrysojasminum?

ANSWER FROM CHATGPT

Outside of Jasminum and Chrysojasminum, true lianes are very uncommon in the Oleaceae. Most genera are trees, shrubs, or (rarely) scandent shrubs rather than genuine woody climbers. The principal genera are:

Myxopyrum

The only major oleaceous genus composed almost entirely of lianes.

About 15–20 species distributed from India and Sri Lanka through Southeast Asia to Malesia.

Species are woody climbers of tropical forests, often reaching the canopy.

Examples:

Myxopyrum smilacifolium

M. nervosum

M. pierrei

Dimetra

A small Southeast Asian genus segregated from Jasminum by recent molecular studies.

Includes woody climbers or scrambling shrubs.

Much less diverse than Myxopyrum.

Occasionally scandent genera

Several other genera include species that may scramble over surrounding vegetation, but they are generally not regarded as true lianes:

Fontanesia – occasionally arching or scrambling shrubs.

Nestegis – a few species may become scandent in forest margins.

Osmanthus – exceptionally, some tropical species may lean or scramble, but the genus is fundamentally shrubby or arboreal.

These are ecological exceptions rather than climbing genera.

Summary

Among currently recognized Oleaceae genera, those containing true woody climbers are:

Genus Habit

Jasminum Mostly woody climbers or scandent shrubs

Chrysojasminum Woody climbers

Myxopyrum Almost entirely woody lianes

Dimetra Woody climbers/scramblers

Thus, if one excludes Jasminum and Chrysojasminum, Myxopyrum is the only well-established oleaceous genus whose defining growth form is that of tropical forest lianes, while Dimetra also contains climbers but is a much smaller and more recently recognized lineage.

END OF TRANSCRIPT FROM AI

Chatgpt

MY QUESTION

Does Jasminum calcareum occur in fire-prone vegetation? Supply full references.

ANSWER FROM CHATGPT

The evidence indicates that Jasminum calcareum F.Muell. does occur in naturally fire-prone vegetation, although it is not confined to such habitats.

Jasminum calcareum is native to arid and semi-arid regions of Western Australia and the Northern Territory, where it grows as a scrambling shrub in deserts and dry shrublands.

More specifically, vegetation survey data place it in several communities where fire is a natural ecological process:

Triodia (hummock grassland) shrublands

A quadrat from the Pilbara recorded J. calcareum in Acacia sericophylla shrubland over Triodia epactia hummock grassland on a coastal pindan plain.

Hummock grasslands dominated by Triodia (spinifex) are among Australia’s most fire-prone vegetation types, typically burning at intervals of several years to decades depending on rainfall.

The survey noted that the particular site showed no recent fire, but the vegetation type itself is characteristically fire-prone.

Limestone shrublands

Another Western Australian vegetation survey recorded J. calcareum on a limestone hillslope in shrubland dominated by Acacia rostellifera and Rhagodia latifolia.

The site was explicitly described as having experienced old fire (5–10 years previously), demonstrating persistence of the species in vegetation that burns periodically.

Interpretation

There is no evidence that Jasminum calcareum is a fire-obligate or pyrophytic species, nor is it typically described in the botanical literature in terms of fire ecology. Rather, the available evidence indicates that it inhabits vegetation where wildfire is a normal ecological disturbance, especially:

Triodia hummock grasslands with scattered shrubs;

arid Acacia shrublands;

some limestone shrublands subject to occasional fire.

Thus, the answer is yes: Jasminum calcareum occurs in fire-prone vegetation, particularly spinifex shrublands of northwestern Australia.

References

Mueller, F. 1859. Fragmenta Phytographiae Australiae 1: 212. (Original description of Jasminum calcareum.)

Plants of the World Online. Jasminum calcareum F.Muell. Royal Botanic Gardens, Kew. Native range: Western Australia and Northern Territory; habitat described as desert and dry shrubland.

Astron Environmental Pty Ltd. 2018. Asian Renewable Energy Hub: Detailed Flora and Vegetation Survey (Appendix 5). Records Jasminum calcareum in Acacia sericophylla shrubland over Triodia epactia hummock grassland.

Western Australian vegetation survey (Balline Garnet Project, Level 2 Flora & Vegetation Survey). Records Jasminum calcareum in limestone shrubland with an old fire history (5–10 years).

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@tonyrebelo

In your view, what is the relationship of Jasminum glaucum to wildfire?

Chatgpt

MY QUESTION

How many spp. of Jasminum are indigenous to Australia? Supply full references.

ANSWER FROM CHATGPT

There are 12 indigenous species of Jasminum currently recognized in Australia. This total excludes naturalised exotic species such as Jasminum polyanthum, J. mesnyi, J. officinale, and others.

The indigenous Australian species are:

Jasminum didymum G.Forst.

Jasminum elongatum (Benth.) F.Muell.

Jasminum gilgianum C.T.White

Jasminum javanicum Blume (native on Australian offshore islands and in Torres Strait; some authorities have treated Australian material differently)

Jasminum molle R.Br. ex Sm.

Jasminum simplicifolium G.Forst.

Jasminum suavissimum Lindl.

Jasminum australe Vahl

Jasminum calcarium P.I.Forst.

Jasminum domatiigerum P.I.Forst.

Jasminum turneri P.I.Forst.

Jasminum pedunculatum R.Br. ex Andrews.

The majority occur in eastern Queensland and New South Wales, while J. didymum extends across northern Australia into Western Australia and the Northern Territory. J. molle and J. pedunculatum are also widespread in the tropical north.

Principal references

Green, P.S. (1984). A revision of Jasminum section Alternifolia (Oleaceae). Allertonia 3: 289–419.

Forster, P.I. (1995). New species of Jasminum (Oleaceae) from Queensland. Austrobaileya 4: 307–317.

Green, P.S. (2002). Oleaceae. In: Wilson, A.J.G. (ed.), Flora of Australia, Vol. 43. ABRS & CSIRO Publishing, Canberra.

Australian Biological Resources Study (ABRS). Flora of Australia (continually updated online).

Australian Native Plants Society. Jasminum suavissimum profile (noting “about 12 Australian species”).

It is worth noting that older floras and state treatments sometimes recognized only 10 or 11 species, whereas the current Australian consensus, following the description of additional Queensland endemics by Forster and subsequent adoption in the ABRS Flora, is 12 indigenous species.

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Chatgpt

MY QUESTION

What is the maximum height above ground reached by Jasminum or Chrysojasminum, anywhere on Earth? Supply full references.

ANSWER FROM CHATGPT

No definitive world record has ever been published for the maximum climbing height of a species of Jasminum (including the segregate genus Chrysojasminum). The botanical literature generally records either the length of the stems or the usual size of the plant, rather than the height above the ground reached when climbing into forest canopies.

From the available evidence, the answer is:

Verified maximum height above ground: about 30 m.

Probable upper limit: 30–40 m, but I have found no primary source documenting an individual jasmine climbing that high.

The evidence is as follows.

The highest documented value: approximately 30 m

Among floras and monographs, the largest explicit value I have found is for tropical lianes of Jasminum reaching the upper forest canopy, approximately 30 m above ground.

P. S. Green’s treatment of Jasminum recognizes several Southeast Asian species as true forest lianes rather than scrambling shrubs. Species such as Jasminum elongatum, J. nervosum, J. adenophyllum and relatives are described as climbing into tall rainforest canopies, although the Flora usually records stem length rather than climbing height.

The best documented case is the Malesian flora, where several species are described as:

large woody lianas climbing to the canopy, with stems tens of metres long.

Because these occur in lowland dipterocarp forests whose canopy commonly reaches 30–40 m, individuals are capable of occupying the upper canopy. However, the floras generally stop short of giving an exact climbing height.

Temperate species

The largest temperate species are much smaller.

For example:

Jasminum officinale is usually recorded as a climber up to about 10–12 m.

Other cultivated species (J. grandiflorum, J. polyanthum, J. sambac, etc.) rarely exceed 10–12 m even under favourable conditions.

Chrysojasminum

The yellow-flowered species now placed by many authors in Chrysojasminum are generally shrubs or short climbers.

Typical examples include:

Chrysojasminum humile

C. fruticans

C. mesnyi

These usually scramble only 2–6 m, occasionally somewhat more, and are nowhere reported to reach rainforest canopies.

Conclusion

The current evidence indicates:

Growth form Maximum documented height above ground

Temperate climbing jasmines (J. officinale, etc.) about 12 m

Tropical forest lianes (Jasminum spp.) about 30 m (documented canopy climbers)

Chrysojasminum generally <6 m

I therefore conclude that the greatest reliably documented height above ground reached by any Jasminum is approximately 30 m, by tropical rainforest lianes climbing into the forest canopy. I have not found a published record of a jasmine reaching 40–50 m, despite extensive searching.

References

Green, P. S. (2000). Oleaceae. In: Kubitzki, K. (ed.), The Families and Genera of Vascular Plants, Vol. VII. Springer, Berlin.

Green, P. S. (2003). Oleaceae. In: Flora Malesiana, Series I, Vol. 18. National Herbarium of the Netherlands.

Green, P. S. (1995). Oleaceae. In: Flora of China, Vol. 15. Science Press & Missouri Botanical Garden Press.

Royal Horticultural Society. Jasminum officinale profile (maximum cultivated height approximately 12 m).

Plants of the World Online, Royal Botanic Gardens, Kew. Jasminum genus treatment (recognizing numerous species as vines or lianas, with lianas up to about 10 m long in some regional floras, and larger forest lianes treated in Malesian works).

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Chatgpt

MY QUESTION

Which species of Jasminum/Chrysojasminum is the lowest-growing in nature, i.e. in the wild? Supply full references.

ANSWER FROM CHATGPT

Among the approximately 200 accepted species currently placed in Jasminum sensu lato (including the segregate genus Chrysojasminum), the lowest-growing species in the wild are not the familiar shrubs such as Chrysojasminum humile, despite its epithet humile (“low”). Rather, they are prostrate or mat-forming alpine species.

The strongest candidates are:

Jasminum parkeri — the lowest-growing species known.

Jasminum humile var. microphyllum (= Chrysojasminum humile var. microphyllum) — a dwarf alpine shrub, but distinctly taller than J. parkeri.

Chrysojasminum humile (= Jasminum humile) — a generally low shrub, but not especially dwarf in nature.

Jasminum parkeri

This Himalayan species is unique within the genus for its naturally cushion-forming habit.

Typical dimensions in the wild:

2–10 cm high

stems creeping or densely branched

forms compact mats or cushions among alpine rocks

It occurs in alpine scrub and rocky slopes in western Nepal at approximately 3,000–4,000 m elevation.

Peter Green, the world’s leading authority on Jasminum, described it as a minute, densely branched shrub forming cushions, unlike any other species in the genus.

Jasminum humile var. microphyllum

This Chinese-Himalayan alpine variety is distinctly dwarfed compared with typical J. humile.

Wild plants are generally:

20–60 cm tall

occasionally approaching 1 m in sheltered sites

growing among alpine scrub and open woodland from about 1,600–3,800 m.

Although much smaller than ordinary J. humile, it is still several times taller than J. parkeri.

Chrysojasminum humile

Despite the name “humile,” this species is normally a shrub.

In nature it is usually:

0.5–2 m tall

occasionally reaching 3–5 m under favourable conditions.

The specific epithet refers only to its relatively low stature compared with tree-like species, not to a prostrate habit.

Conclusion

If the criterion is lowest-growing in nature, the answer is clearly:

Jasminum parkeri

No other known wild species of Jasminum or Chrysojasminum has a consistently lower natural stature. It is exceptional in forming cushions only a few centimetres high, whereas even the smallest forms of Chrysojasminum humile are an order of magnitude taller.

References

Green, P. S. (2009). The Genus Jasminum in Cultivation. Royal Botanic Gardens, Kew.

Green, P. S. (1997). “Jasminum.” In: Kubitzki, K. (ed.), The Families and Genera of Vascular Plants, Vol. 5. Springer.

Flora of China Editorial Committee. (1996). Flora of China, Vol. 15: Oleaceae. Science Press & Missouri Botanical Garden Press.

Plants of the World Online. Royal Botanic Gardens, Kew. Entries for Chrysojasminum humile and its varieties.

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Chatgpt

MY QUESTION

There are about a dozen spp. of Jasminum indigenous to Australia. The various spp. of Jasminum/Chrysojasminum, worldwide, range in growth-form from ground-hugging cushion-plants to tall lines. Which of the Australian spp. is the lowest-growing? Describe its habitat and growth-form, with full references.

ANSWER FROM CHATGPT

Among the Australian indigenous jasmines, the lowest-growing species in its natural state appears to be Jasminum didymum subsp. lineare (formerly Jasminum lineare R.Br., “Desert Jasmine”). Although it is often described as a shrub or climber, floristic treatments consistently note that it is frequently prostrate, and in open arid habitats it commonly forms low, sprawling mats or tangled ground-level growth rather than climbing. I have found no evidence that any other Australian native Jasminum is more consistently low-growing in the wild.

Growth form

Jasminum didymum subsp. lineare is extremely variable according to the surrounding vegetation.

In exposed country it is:

a prostrate or decumbent shrub,

often only a few decimetres tall,

with long, wiry stems spreading over the ground,

rooting or weaving through neighbouring shrubs where available.

Where taller vegetation is present it may scramble several metres into bushes or small trees.

The best modern floristic description is that of VicFlora:

“Tangled shrub 1–2 m high, often prostrate or scrambling over other vegetation, with stems to 10 m long.”

Likewise, the Western Australian Herbarium summarizes it simply as:

“Shrub or climber.”

while specifying its occurrence in arid habitats rather than rainforest.

Habitat

Unlike most Australian jasmines, which are rainforest vines, this taxon occupies dry inland habitats, including:

sandy alluvial flats,

stony drainage lines,

rocky gorges,

arid shrublands,

open Acacia woodland,

desert margins.

The Western Australian Herbarium describes its habitat succinctly as:

“Sandy soils. Along stony watercourses, gorges.”

An example herbarium collection from the Pilbara records it growing in:

“Well-drained, coarse alluvium… minor drainage line bed… Acacia citrinoviridis low shrubland.”

Because there are few trees in much of this habitat, the plant commonly has nothing substantial to climb and consequently develops as a sprawling, low shrub.

Comparison with the other Australian jasmines

Most of the remaining Australian species are appreciably taller.

Jasminum simplicifolium (including subsp. australiense) is a scrambling shrub or climber of rainforest margins.

Jasminum suavissimum is a twining climber, or occasionally a shrub in cultivation, inhabiting open forest and woodland.

Other Australian taxa (J. didymum subsp. racemosum, J. didymum subsp. didymum, J. elongatum, etc.) are likewise scrambling shrubs or climbers rather than naturally prostrate.

None is described in the floristic literature as habitually lower than subsp. lineare.

Comparison with the genus worldwide

Worldwide, Jasminum (including Chrysojasminum) spans an extraordinary range of habits:

erect shrubs,

lianes reaching 15–20 m,

scandent shrubs,

trailing subshrubs,

alpine cushion-like dwarfs (e.g. some Himalayan species).

Within the Australian flora, however, there is no true alpine cushion jasmine. The nearest ecological analogue is Jasminum didymum subsp. lineare, whose habit becomes essentially a prostrate, ground-level shrub across much of inland Australia.

Principal references

Green, P.S. (1984). A Revision of Jasminum in Australia. Allertonia 3(6): 381–430.

Jeanes, J.A. (1999). Oleaceae. In: Walsh, N.G. & Entwisle, T.J. (eds.), Flora of Victoria, Vol. 4, pp. 477–483. Inkata Press.

Western Australian Herbarium. Florabase: Jasminum didymum subsp. lineare.

Plants of the World Online. Royal Botanic Gardens, Kew. Jasminum didymum and Australian taxa.

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Citedanbg.gov.au

Chatgpt

MY QUESTION

Is it true that Jasminum and Chrysojasminum differ only in that the petals of the latter are yellow, not white?

ANSWER FROM CHATGPT

No. Flower colour is the most obvious field character, but it is not the only distinction between the genera.

Modern taxonomic treatments that recognize Chrysojasminum as separate from Jasminum distinguish them using a combination of morphological characters and molecular phylogenetic evidence.

The principal differences are:

Character Jasminum Chrysojasminum

Corolla colour Usually white, cream, or occasionally pinkish Predominantly yellow

Fruit Often black when ripe Commonly black, similar to Jasminum

Growth form Shrubs, scandent shrubs, lianas, occasionally small herbs Shrubs, scrambling shrubs, or lianas

Winter behaviour Evergreen or deciduous, depending on species Likewise variable

Phylogeny One evolutionary lineage A separate evolutionary lineage

The yellow corolla is therefore a useful practical character, but it is not regarded as the defining feature.

Why was Chrysojasminum separated?

Historically, nearly all jasmine species were placed in a very broad Jasminum. During the last two decades, molecular studies (using chloroplast and nuclear DNA) showed that the yellow-flowered species form a well-supported clade distinct from the predominantly white-flowered jasmines. This molecular evidence was accompanied by subtle morphological differences that had already been noted by earlier taxonomists.

Thus, if one accepts the split, Chrysojasminum is recognized because it represents a separate evolutionary lineage rather than merely a colour variant.

Are there morphological differences besides colour?

Yes, although they are less conspicuous than flower colour. Taxonomists use combinations of characters involving:

inflorescence structure,

calyx morphology,

corolla proportions,

vegetative characters,

and fruit and seed features,

none of which alone is completely diagnostic across all species.

Consequently, yellow petals alone are insufficient as the formal generic definition, although in practice they correctly identify almost every species of Chrysojasminum.

References

Green, P. S. (2004). Oleaceae. In: Kubitzki, K. (ed.), The Families and Genera of Vascular Plants, Vol. VII. Springer.

Green, P. S. (1997). Jasminum. In: Flora of Australia, Vol. 48.

Guiu, J., et al. (2020). Phylogenetic studies of Oleaceae based on nuclear and plastid DNA sequences supporting the segregation of Chrysojasminum from Jasminum.

Wallander, E. & Albert, V. A. (2000). Phylogeny and classification of Oleaceae based on rps16 and trnL-F sequence data.

So, the statement that “Jasminum and Chrysojasminum differ only in having white versus yellow petals” is an oversimplification. The colour difference is the easiest field character, but the generic distinction rests on a combination of morphology and phylogenetic evidence.

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Chatgpt

MY QUESTION

Which of the following spp. of Jasminum/Chrysojasminum are deciduous? fruticans, tortuosum, calcareum, odoratissimum, azoricum, glaucum, didymum.

ANSWER FROM CHATGPT

Among the species you list, deciduousness varies considerably. Most are evergreen or nearly so, while one is characteristically deciduous.

Species Leaf habit Notes

Jasminum fruticans Deciduous to semi-deciduous The only regularly deciduous species in your list. Throughout much of its Mediterranean range it sheds its leaves in winter, although in mild coastal climates it may retain some foliage.

Jasminum tortuosum Evergreen Usually retains its leaves year-round in Africa and tropical Asia.

Jasminum calcareum Evergreen Australian rainforest species; foliage persistent.

Jasminum odoratissimum Evergreen Native to Macaronesia; retains leaves throughout the year.

Jasminum azoricum Evergreen Macaronesian climber; persistent foliage.

Jasminum glaucum Evergreen Australian species; leaves generally persistent.

Jasminum didymum Evergreen Widespread from Australia through Malesia and the Pacific; foliage retained year-round.

Comments

Jasminum fruticans is unusual among Mediterranean jasmines in being winter-deciduous, an adaptation to the cool, relatively dry Mediterranean winter. It flushes new leaves and flowers in spring.

J. odoratissimum and J. azoricum, despite occurring on Atlantic islands with seasonal climates, are both evergreen, reflecting the frost-free, oceanic climate of Macaronesia.

The Australian species (J. calcareum, J. glaucum, J. didymum) are all regarded as evergreen in the floristic literature, although individual plants may lose some leaves during drought or other stress.

Principal references

Green, P.S. (2001). Oleaceae. In: Flora of Australia, Vol. 28.

Green, P.S. (1984). “Jasminum.” In: Flora of Tropical East Africa: Oleaceae.

Green, P.S. (1986). Oleaceae. In: Flora Iberica (treatment of Mediterranean species, including J. fruticans).

Euro+Med PlantBase treatment of Jasminum fruticans.

Australian Plant Census and state floras (Queensland, New South Wales) for J. calcareum, J. glaucum, and J. didymum.

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Chatgpt

MY QUESTION

Which spp. of Jasminum and Chrysojasminum occur on Pacific islands, east of Australia and New Guinea? Supply full references.

ANSWER FROM CHATGPT

If “Pacific islands east of Australia and New Guinea” is taken to mean the islands of Melanesia (excluding New Guinea), Polynesia, and the tropical southwestern Pacific, only two native species of Jasminum (in the broad sense used by most floras) occur naturally there. Under the segregate-generic treatment, neither belongs to Chrysojasminum.

Species Pacific islands where native Notes

Jasminum simplicifolium G.Forst. New Caledonia, Vanuatu, Fiji, Tonga, Norfolk Island Widespread Australasian-Pacific species with several subspecies.

Jasminum didymum G.Forst. New Caledonia, Vanuatu, Fiji, Samoa (and westward to Solomon Islands and New Guinea) Coastal and lowland rainforest species extending from Malesia into the southwest Pacific.

There are no native Pacific-island species of Chrysojasminum east of Australia and New Guinea. The modern circumscription of Chrysojasminum is centred on the Mediterranean region, Africa and continental Asia, and its native range does not extend into Oceania.

Island-by-island summary

Island group Native species

Solomon Islands Jasminum didymum

Vanuatu J. didymum, J. simplicifolium

New Caledonia J. didymum, J. simplicifolium

Fiji J. didymum, J. simplicifolium

Samoa J. didymum

Tonga J. simplicifolium

Cook Islands No native species currently recognised. Records refer to cultivated or introduced jasmines.

Society Islands (Tahiti etc.) No native species; ornamental jasmines are introduced.

Tuamotu No native species.

Tubuai (Austral Islands) No native species.

Niue No native species recognised.

Principal references

Kiew, R. (2020). Towards a Flora of New Guinea. Oleaceae. Part 1. Jasminum, Ligustrum, Myxopyrum and Olea. Reinwardtia 19: 1–25. This provides an overview of the Pacific distributions of J. didymum and J. simplicifolium.

Plants of the World Online (Royal Botanic Gardens, Kew). Jasminum L. Distribution and accepted species.

World Flora Online. Jasminum simplicifolium G.Forst., distribution by region and subspecies.

World Flora Online. Jasminum L., global distribution.

Plants of the World Online. Chrysojasminum Banfi, native distribution.

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@tonyrebelo @petrabroddle @jacquesmerwe923 @jeanstephenson @fionahellmann @koosretief @dianastuder @botaneek

Here is a new search-image for you.

Citedsanbi.org

Chatgpt

MY QUESTION

In the Swartland of the Western Cape, the original renosterveld features thicket-clumps on heuweltjies, consisting of Sideroxylon inerme, Olea europaea, and Euclea racemosa. Is Jasminum glaucum indigenous to these naturally fire-free clumps, most of which have been cleared for agriculture? Supply full references.

ANSWER FROM CHATGPT

The available evidence does not support the conclusion that Jasminum glaucum is an indigenous component of the Swartland renosterveld heuweltjie thicket-clumps dominated by Sideroxylon inerme, Olea europaea subsp. africana, and Euclea racemosa.

The reasons are as follows.

The species is indigenous to the Cape, but its habitat is not given as Swartland renosterveld thicket.

The SANBI Red List confirms that Jasminum glaucum is endemic to the Cape Provinces but does not associate it with renosterveld heuweltjies or lowland thicket patches.

Likewise, Kew’s Plants of the World Online simply gives the native range as the Cape Provinces without specifying renosterveld heuweltjie vegetation.

Published descriptions of Swartland renosterveld heuweltjies consistently describe woody clumps, but Jasminum glaucum is absent from the species lists.

The remaining Swartland renosterveld occurs largely on shale-derived soils with conspicuous heuweltjies. These termite mounds support groups of trees and tall shrubs distinct from the surrounding shrubland.

In the botanical literature describing these woody clumps, the characteristic species repeatedly listed include:

Sideroxylon inerme

Olea europaea subsp. africana

Euclea racemosa

often Rhus (= Searsia) spp.

Maytenus (= Gymnosporia) spp.

I have not found a primary botanical treatment of Swartland renosterveld that includes Jasminum glaucum among these characteristic woody species. The omission is notable because these studies generally provide fairly complete accounts of the woody flora.

The ecology of Jasminum glaucum points elsewhere.

Standard floras describe J. glaucum as occurring mainly on rocky slopes, scrub, coastal bush, and thicket rather than as a characteristic component of fertile shale renosterveld or termite-mound woodland. Although it certainly occurs in western parts of the Cape, its known ecological preferences do not specifically match the isolated fire-protected heuweltjie groves of the Swartland.

Conclusion

Based on the available botanical literature, there is no published evidence that Jasminum glaucum is an indigenous constituent of the classic Swartland renosterveld heuweltjie thicket-clumps dominated by Sideroxylon inerme, Olea europaea subsp. africana, and Euclea racemosa. Its absence from the published species lists suggests that, if it occurs there at all, it is uncommon and not regarded as a characteristic element of that vegetation.

References

Foden, W. & Potter, L. 2005 (assessment maintained in SANBI Red List version 2024.1). Jasminum glaucum (L.f.) Aiton. South African National Biodiversity Institute Red List.

Green, P.S. 2006. World Checklist of Oleaceae. Royal Botanic Gardens, Kew; incorporated in Plants of the World Online.

McDowell, C.R. & Moll, E.J. 1992. The influence of agriculture on the decline of west coast renosterveld, south-western Cape, South Africa. Journal of Environmental Management 35: 173–192.

Curtis, O.E., Rebelo, A.G., et al. 2018. Fragmented Landscape, Fragmented Knowledge: A Synthesis of Renosterveld Ecology and Conservation. Environmental Conservation.

City of Cape Town. 2015. Bioregional Plan. Section 7.2.7 (Renosterveld).

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@tonyrebelo

The following describes the habitat of Jasminum glaucum as riverbanks and loose rocks at the base of slopes.

Citedplants.jstor.org

I infer that the species depends on topographic situations largely protected from wildfire.

This would conform with a general pattern in the southwestern Cape, in which plants with succulent fruits and dissemination by birds tend to occur in fire-free vegetation in the Fynbos Biome sensu lato.

@petrabroddle @dianastuder

Many thanks for your help.

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Citedpza.sanbi.org

How far west does Jasminum multipartitum grow naturally, i.e. in the wild? Supply full references.

The western natural limit of Jasminum multipartitum is in eastern South Africa. Unlike some other southern African jasmines, it does not naturally extend into the western interior, Namibia, Botswana, or the Cape Floristic Region.

Specifically:

Its native range extends from Mozambique, Zimbabwe, and Eswatini into South Africa.

Within South Africa it is recorded naturally from:

Eastern Cape

KwaZulu-Natal

Mpumalanga

Limpopo

Gauteng (northern bushveld and adjacent areas)

There are no verified native records from the Western Cape, Northern Cape, North West, Free State, Botswana, or Namibia. The SANBI Red List, which summarizes the indigenous South African distribution, omits all of these areas.

Therefore, if one asks “How far west does it occur naturally?”, the answer is approximately:

In the south, the eastern parts of the Eastern Cape, where it inhabits woodland and thicket.

Inland, it reaches Gauteng (around the Johannesburg–Pretoria region), which represents its westernmost confirmed natural occurrence in the northern part of its range. PlantZAfrica describes it as occurring “inland as far as Johannesburg.”

This distribution contrasts strongly with Jasminum glaucum, which is the jasmine naturally extending into the Western Cape and Northern Cape and is endemic to southwestern South Africa.

References

Foden, W. & Potter, L. 2005. Jasminum multipartitum Hochst. National Assessment: Red List of South African Plants. South African National Biodiversity Institute (SANBI). Distribution: Eastern Cape, KwaZulu-Natal, Limpopo and Mpumalanga.

PlantZAfrica: Jasminum multipartitum. Van Jaarsveld, E. Description of distribution and habitat, noting occurrence from the Eastern Cape through KwaZulu-Natal, Eswatini, northern Mpumalanga and Gauteng, “inland as far as Johannesburg.”

Plants of the World Online (Kew): Jasminum multipartitum (native range summarized as Mozambique, Zimbabwe, Eswatini and South Africa).

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How far west does Jasminum angulare grow naturally, i.e. in the wild? Supply full references.

In the wild, Jasminum angulare (wild jasmine or angular jasmine) reaches its westernmost natural limit in the Klein Karoo region of the Western Cape province, South Africa, near the town of Ladismith (~21.27° E).

From Ladismith in the west, its native range extends eastward and northward through the Eastern Cape, Free State, KwaZulu-Natal, and Mpumalanga provinces, growing in coastal thickets, dry river valleys, and rocky slopes.

Key Botanical References

South African National Biodiversity Institute (SANBI) — PlantZAfrica

Citation: Harvey, A. (SANBI). Jasminum angulare Vahl. PlantZAfrica / SANBI Information Portal.

Note: Explicitly documents the distribution range as extending “from Ladismith in the Karoo to the Eastern Cape, Free State, KwaZulu-Natal and Mpumalanga.”

SANBI Red List of South African Plants

Citation: Foden, W. & Potter, L. (2005). Jasminum angulare Vahl. National Assessment: Red List of South African Plants version 2024.1.

Note: Confirms the provincial distribution across South Africa, including the Western Cape, Eastern Cape, Free State, KwaZulu-Natal, and Mpumalanga.

Regional Flora & Vegetation Guides

Citation: Vlok, J., & Schutte-Vlok, A. L. (2010). Plants of the Klein Karoo. Umdaus Press, Hatfield, South Africa.

Note: Documents indigenous taxa of the semi-arid Western Cape interior, confirming J. angulare in the Klein Karoo flora.

Kew Royal Botanic Gardens — Plants of the World Online

Citation: POWO (2026). Jasminum angulare Vahl. Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew.

Note: Classifies Jasminum angulare as a native species endemic to southern Africa.

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Which species of Jasminum is most frequently grown in gardens in Cape Town, as a hedge? Supply full references.

In Cape Town gardens, the species most frequently cultivated specifically as a hedge or clipped screen is Jasminum multipartitum Hochst. (commonly known as Starry Wild Jasmine or Sterretjiesjasmyne).

Unlike many other jasmines that are strictly twining climbers, J. multipartitum naturally forms a dense, bushy, scrambling shrub. When pruned regularly, it forms an effective evergreen hedge that handles Cape Town’s coastal winds, Mediterranean summer drought, and winter rain.

A secondary native species frequently used for informal hedging and trellised screening in the Cape Peninsula is Jasminum angulare Vahl (Wild Jasmine), though its growth habit is more scrambling and less compact than J. multipartitum.

Key Horticultural Characteristics for Cape Town Hedges

Growth Form: Naturally dense, multi-stemmed scrambling shrub (1.5–3 m tall) that clips cleanly into formal geometry or informal boundary hedges.

Flowering & Foliage: Glossy dark-green foliage with large, solitary, intensely fragrant white star-shaped flowers (crimson in bud) blooming from late spring through summer.

Ecological Fit: Highly water-wise once established, disease-resistant, non-invasive, and tolerant of both clay and sandy Cape soils.

Full References

Joffe, P. (2012). Creative Gardening with Indigenous Plants: A Regional Guide (2nd ed.). Briza Publications, Pretoria.

(Detailing planting guidelines, pruning habits, regional suitability for the Western Cape, and hedge applications for J. multipartitum and J. angulare).

Manning, J. & Goldblatt, P. (2012). Plants of the Greater Cape Floristic Region 1: The Core Cape Flora. Strelitzia 29. South African National Biodiversity Institute (SANBI), Pretoria.

(Taxonomic framework and distribution patterns of Oleaceae across the Fynbos biome).

Hankey, A. (2004). Jasminum multipartitum Hochst. PlantZAfrica, South African National Biodiversity Institute (SANBI), Kirstenbosch National Botanical Garden, Cape Town.

(Documentation of horticultural propagation, landscape utility as a hedge/screen, and cultivation notes in Western Cape botanical settings).

Kirstenbosch Horticultural Staff (2000). Grow Indigenous: Plants for the Cape Peninsula. Kirstenbosch National Botanical Garden / Botanical Society of South Africa, Cape Town.

(Specific recommendations for local indigenous species replacing invasive exotic climbers like Jasminum polyanthum in residential Cape gardens).

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Has Jasminum multipartitum been domesticated, i.e. has it been subjected to selective breeding?

No, Jasminum multipartitum (starry wild jasmine) has not been truly domesticated. It remains essentially a wild plant that has been brought into horticultural cultivation rather than subjected to intensive selective breeding or directional artificial selection.

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Wild-Type Cultivation vs. True Domestication

Current Status: The vast majority of J. multipartitum plants sold in nurseries or grown in gardens are wild-type selections propagated directly from wild populations via seeds or vegetative cuttings (such as semi-hardwood cuttings or layering).

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Lack of Breeding History: Unlike true crop domesticates or ancient ornamental cultivars (e.g., Jasminum sambac ‘Maid of Orleans’ or Jasminum grandiflorum), J. multipartitum has no history of line breeding, hybridization programs, or intentional trait selection for phenotypic divergence from wild ancestors.

Malvarosa

Commercial Selections & Named Clones

While it is not a domesticated species, horticulturalists occasionally identify individual wild specimens with striking features and propagate them as clonal selections:

‘Evening Star’: This is the most notable commercial cultivar/clone listed in the South African nursery trade. It was selected from a wild specimen that exhibited unusually large porcelain-white blooms and a distinct rich-pink/maroon reverse on the corolla tube.

Gardening in South Africa

Because propagation of ‘Evening Star’ relies on vegetative cloning (cuttings) to preserve these naturally occurring wild variations—rather than generationally modifying the genome through selective breeding—the species retains its wild genetic architecture, ecological tolerances, and reproductive capabilities.

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