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FOC | Family List | FOC Vol. 24 | Dioscoreaceae | Dioscorea

4. Dioscorea sect. Shannicorea Prain & Burkill, J. Proc. Asiat. Soc. Bengal. 10: 7. 1914.

顶生翅组 ding sheng chi zu

Rootstock of vertical, annual to biennial tubers. Stem twining to left, often pubescent. Bulblets absent. Leaves alternate, simple; leaf blade reniform to ovate, papery, margin entire. Male inflorescence a spikelike thyrse. Flowers in cymules, pedicellate; perianth campanulate, cupular, or saucer-shaped, lobes connate at base; stamens 6, inserted at base of perianth lobes or in throat of tube, anthers dorsifixed, introrse. Female inflorescences solitary or 2 or more together. Capsule usually reflexed at maturity, longer than wide; wings often undulate. Seeds inserted near base of capsule; wing pointing toward capsule apex.

About eight species: Cambodia, China, Laos, Myanmar, Thailand, Vietnam; seven species (four endemic) in China.

1 Leaf blade thinly papery; male flowers in sessile clusters, minutely papillose-puberulent; perianth saucer-shaped   21 D. tentaculigera
+ Leaf blade papery; male flowers in stalked cymules, pubescent, sometimes glabrescent; perianth campanulate or cupular.   (2)
2 (1) Leaf blade as wide as or wider than long.   (3)
+ Leaf blade longer than wide.   (5)
3 (2) Leaf blade glabrous or sparsely pubescent abaxially; capsule glabrous   24 D. subcalva
+ Leaf blade densely softly hairy abaxially; capsule pubescent.   (4)
4 (3) Leaf blade reniform- or broadly cordate, apex shortly acuminate; infructescence 9--27 cm; capsule reflexed, wings obviously undulate   22 D. yunnanensis
+ Leaf blade orbicular- or ovate-cordate, apex acuminate or caudate-acuminate; infructescence to only 3 cm, often shorter than mature capsules; capsule erect, wings entire to slightly undulate   23 D. hemsleyi
5 (2) Plant sparsely pubescent   25 D. nitens
+ Plant densely pubescent, especially on leaf blade abaxially and inflorescence axis.   (6)
6 (5) Leaf blade abaxially white pubescent; peduncle simple   26 D. martini
+ Leaf blade abaxially tawny pubescent; peduncle usually branched   27 D. velutipes

Lower Taxa


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