Duma (plant)
Duma is a genus of shrubby flowering plants in the family Polygonaceae, subfamily Polygonoideae. The genus was separated from Muehlenbeckia in 2011.[2] The native range of the genus is Australia.[1]
| Duma | |
|---|---|
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| Duma florulenta | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Polygonaceae |
| Subfamily: | Polygonoideae |
| Genus: | Duma T.M.Schust.[1] |
Description
Species of Duma are shrubs, with many flexible branches, whose tips are thornlike. They have white to greyish bark. The leaves are longer than wide, with a very small curved spine at the tip. The flowers are without stalks (petioles). Plants are dioecious. Staminate flowers have eight stamens and a rudimentary or missing pistil; pistillate flowers have staminodes. The fruit is in the form of an ovoid or three-angled achene, which is smooth and shiny.[3]
Taxonomy
The genus Duma was created by Tanja Schuster in 2011 for some species previously placed in Muehlenbeckia, but which were shown by molecular phylogenetic studies to form a distinct clade. The name is derived from the Latin for "thorn-bush".[3] Duma is placed in the tribe Polygoneae of the subfamily Polygonoideae. Within the tribe, it is most closely related to the genera Atraphaxis and Polygonum, forming the so-called "DAP clade", and is not so closely related to Muehlenbeckia.[2]
| Polygoneae |
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Species
As of March 2019, three species were accepted by Plants of the World Online:[1]
- Duma coccoloboides (J.M.Black) T.M.Schust. (syn. Muehlenbeckia coccoloboides)
- Duma florulenta (Meisn.) T.M.Schust. (syn. Muehlenbeckia florulenta)
- Duma horrida (H.Gross) T.M.Schust. (syn. Muehlenbeckia horrida)
References
- "Duma T.M.Schust.", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2019-03-04
- Schuster, Tanja M.; Reveal, James L.; Bayly, Michael J. & Kron, Kathleen A. (2015), "An updated molecular phylogeny of Polygonoideae (Polygonaceae): Relationships of Oxygonum, Pteroxygonum, and Rumex, and a new circumscription of Koenigia", Taxon, 64 (6): 1188–1208, doi:10.12705/646.5
- Schuster, T.M.; Wilson, K.L. & Kron, K.A. (2011), "Phylogenetic relationships of Muehlenbeckia, Fallopia and Reynoutria (Polygonaceae) investigated with chloroplast and nuclear sequence data", International Journal of Plant Sciences, 172: 1053–1066, doi:10.1086/661293, JSTOR 10.1086/661293