Biology:Asclepias macropus
| Asclepias macropus | |
|---|---|
| File:Asclepias macropus in flower.jpg | |
| Asclepias macropus in flower | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Gentianales |
| Family: | Apocynaceae |
| Genus: | Asclepias |
| Species: | A. macropus
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| Binomial name | |
| Asclepias macropus (Schltr.) Schltr.
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| Synonyms[1] | |
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Asclepias macropus is a species of flowering plant in the family Apocynaceae. It is native to southern Africa, where it occurs in South Africa, including the Cape Provinces, Free State, KwaZulu-Natal, and the Northern Provinces.[1] It is a rhizomatous geophyte adapted to subtropical environments.[1]
Description
Asclepias macropus is a perennial geophytic herb with underground rhizomes that allow it to survive seasonal drought and other environmental stresses.[1] Like other members of the genus, it produces milky latex and specialized flowers with a complex corona and pollinia adapted for insect pollination.
As a geophyte, the species likely dies back to underground structures during unfavorable seasons and resprouts when conditions improve, a common strategy among plants in fire-prone or seasonally dry habitats.
Taxonomy
The species was originally described as Gomphocarpus macropus by Rudolf Schlechter in 1894 and later transferred to the genus Asclepias.[1]
Its taxonomic history reflects broader uncertainty in the classification of African members of the subfamily Asclepiadoideae, many of which have been moved between genera such as Gomphocarpus, Stathmostelma, and Asclepias based on differing interpretations of morphological characters.
Phylogeny
Recent phylogenomic studies using nuclear loci from the Angiosperms353 probe set have supported the monophyly of Asclepias in both a broad (sensu lato) and narrow (sensu stricto) sense.[2]
These analyses indicate that the genus is divided into two major clades: a New World clade comprising the traditionally circumscribed genus and an Old World clade representing the African Asclepias complex.[2]
The African complex, which includes species such as A. macropus, remains taxonomically challenging due to high morphological diversity and weak correspondence between morphological characters and evolutionary relationships.[2]
Distribution and habitat
Asclepias macropus is native to southern Africa, where it is distributed across several regions of South Africa.[1] It grows primarily in subtropical biomes, likely in open habitats such as grasslands or seasonally dry environments.
Ecology
Like other milkweeds, Asclepias macropus is expected to be pollinated by insects and to produce seeds adapted for wind dispersal. Its geophytic growth form suggests adaptation to disturbance regimes such as fire or drought.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "Asclepias macropus". Royal Botanic Gardens, Kew. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:94431-1.
- ↑ 2.0 2.1 2.2 Yang, Qiyi (2023). Phylogenetics of the African Asclepias Complex (Apocynaceae) Based on Angiosperm 353 Universal Probe Set (Thesis). Queen Mary University of London. doi:10.34885/gyk6-4m40.
Wikidata ☰ Q15395993 entry
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