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Dioscoraceae: Rajania prestoniensis

J.Bisse, 20/43


Rajania prestoniensis R.Knuth

Original Distribution

Cuba, Holguin

Extinction Data

Earth Witness community - Extinct


Herbs twining or woody vines, rarely erect, small herbs. Rootstock rhizomatous or tuberous. Stem twining to left or right, pubescent or glabrous, sometimes prickly. Leaves alternate or opposite, petiolate, simple or palmately compound, basal veins 3--13, interstitial veins reticulate; leaflets of palmately compound leaves often ovate or lanceolate. Flowers usually unisexual (when plants dioecious, rarely monoecious), sometimes bisexual, solitary, clustered, or in cymules, these in a spike, raceme, or thyrse, these sometimes grouped into panicles. Male flowers: perianth lobes 6, in 2 whorls, basally connate or free; stamens 6, sometimes 3 reduced to staminodes or absent, inserted on perianth or receptacle; ovary rudimentary or absent. Female flowers: similar to male ones; staminodes 3, 6, or absent; ovary inferior, 3-loculed, ovules usually 2 per locule (more than 2 in a few small genera), placentation axile; styles 3, free

Number of Specimens at Kew


Seed Data

Fruit a capsule, berry, or samara. Seeds with a membranous wing or not; endosperm present; embryo small.

Specimen Type (Y/N)


Kew Herbcat Barcode Number




Collector Number


Date Collected

21st August 1971

Other Information

  Det R.Rankin 1996 - Det L.Raz 2004. There is an examples in the New York Herbarium, Specimen ID 73504

Information Sources

Borhidi, A., O. Muñiz (1983) Catálogo de plantas Cubanas amenazadas o extinguidas. Acad. Ciencias de Cuba, La Habana, pp 57Walter, K.S. and Gillett, H.J. (eds) (1998). 1997 IUCN Red List of Threatened Plants. Compiled by the World Conservation Monitoring Centre IUCN – The World Conservation Union, Gland, Switzerland and Cambridge, UK