Daubenya
| Daubenya | |
|---|---|
| File:Daubenya aurea var coccinea2.jpg | |
| Daubenya ?marginata in cultivation in Japan | |
| Scientific classification Edit this classification | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Asparagaceae |
| Subfamily: | Scilloideae |
| Genus: | Daubenya Lindl.[1] |
| Type species | |
| Daubenya aurea | |
| Synonyms | |
| |
Daubenya is a genus of bulbous flowering plants in the family Asparagaceae, subfamily Scilloideae (also treated as the family Hyacinthaceae).[2] It is native to the Cape Province of South Africa.[1]
At first believed to consist of a single species, Daubenya aurea, the genus was expanded in 2000 to include the genera Androsiphon and Amphisiphon and various species that had previously been classified as Polyxena, Massonia, or Neobakeria. "The poor congruence between morphological and other characters within Hyacinthaceae has also made generic circumscriptions very difficult. One of the consequences of this has been the recognition of a large number of genera that are poorly defined morphologically."- (Speta 1998)
Description
[edit | edit source]Species of Daubenya grow from bulbs covered with a brownish tunic. Each bulb produces only two leaves, which appear with the flowers and normally spread out along the ground on either side. The inflorescence is a raceme, usually very condensed and close to the ground. Individual flowers are white, pink, yellow or red, sometimes with the tepals furthest from the flowering stem (i.e. on the outside of the inflorescence) larger than the others. The tepals are fused at the base forming a distinct tube. The stamens arise from the mouth of this tube, and are often very prominent. The more or less globe-shaped black seeds are produced inside a papery capsule.[3][4]
Species are variously pollinated by bees, butterflies, moths, the monkey beetle Lepisia glenlyonensis[5] and sunbirds.[6] The water-retaining nature of doleritic clays ensures their remaining moist for longer than clays formed from shales of the Karoo series. Exceptionally, D. namaquensisis, is found in deep red sands and D. zeyheri in calcareous coastal sands.
There is no formal conservation policy for Daubenya species and their future prospects remain bleak. Cultivated bulbs of D. aurea are on offer at commercial nurseries, though all the species are worthy of cultivation for their bright and often fragrant flowers.[7]
Species
[edit | edit source]As of March 2013[update], the World Checklist of Selected Plant Families recognized eight species:[8] All but D. aurea were transferred to the genus Daubenya during revisions of the South African members of the Scilloideae in early 2000s; they were previously placed in Androsiphon, Amphisiphon, Polyxena, Massonia, or Neobakeria.[9]
| Image | Scientific name | Distribution |
|---|---|---|
| File:Daubenya alba 15432154.jpg | Daubenya alba A.M.van der Merwe | Northern Cape Province. |
| File:Daubenya aurea 15458803.jpg | Daubenya aurea Lindl. | South Africa |
| File:Daubenya capensis 94292202.jpg | Daubenya capensis (Schltr.) A.M.van der Merwe & J.C.Manning (syn. Androsiphon capensis Schltr.) | northwest Cape |
| Daubenya comata (Burch. ex Baker) J.C.Manning & A.M.van der Merwe (syn. Massonia comata Burch. ex Baker) | Free State, Northern Cape and the North Eastern parts of Western Cape | |
| File:Daubenya aff. marginata-2.jpg | Daubenya marginata (Willd. ex Kunth) J.C.Manning & A.M.van der Merwe (syn. Massonia marginata Willd. ex Kunth) | northwest Cape. |
| Daubenya namaquensis (Schltr.) J.C.Manning & Goldblatt (syn. Neobakeria namaquensis Schltr.) | Namaqualand. | |
| File:Daubenya stylosa 43525364.jpg | Daubenya stylosa (W.H.Baker) A.M.van der Merwe & J.C.Manning (syn. Amphisiphon stylosus W.H.Baker) | Bokkeveld Plateau. |
| File:Daubenya zeyheri00.jpg | Daubenya zeyheri (Kunth) J.C.Manning & A.M.van der Merwe (syn. Massonia zeyheri Kunth) | South Western Cape. |
References
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- ^ Stevens, P.F. (2001 onwards), "Asparagales: Scilloideae", Angiosperm Phylogeny Website, retrieved 2013-03-28
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External links
[edit | edit source]- Error creating thumbnail: File missing Media related to Lua error in Module:Commons_link at line 62: attempt to index field 'wikibase' (a nil value). at Wikimedia Commons
- File:Wikispecies-logo.svg Data related to Daubenya at Wikispecies
- Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). – photographs of six species
- Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). – photographs of seven species
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