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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.
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| 1 |
Leaf blade thinly papery; male flowers in sessile clusters, minutely papillose-puberulent; perianth saucer-shaped |
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21 D. tentaculigera |
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Leaf blade papery; male flowers in stalked cymules, pubescent, sometimes glabrescent; perianth campanulate or cupular. |
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(2) |
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| 2 (1) |
Leaf blade as wide as or wider than long. |
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(3) |
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Leaf blade longer than wide. |
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(5) |
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| 3 (2) |
Leaf blade glabrous or sparsely pubescent abaxially; capsule glabrous |
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24 D. subcalva |
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Leaf blade densely softly hairy abaxially; capsule pubescent. |
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(4) |
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| 4 (3) |
Leaf blade reniform- or broadly cordate, apex shortly acuminate; infructescence 9--27 cm; capsule reflexed, wings obviously undulate |
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22 D. yunnanensis |
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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 |
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23 D. hemsleyi |
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| 5 (2) |
Plant sparsely pubescent |
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25 D. nitens |
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Plant densely pubescent, especially on leaf blade abaxially and inflorescence axis. |
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(6) |
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| 6 (5) |
Leaf blade abaxially white pubescent; peduncle simple |
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26 D. martini |
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Leaf blade abaxially tawny pubescent; peduncle usually branched |
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27 D. velutipes |
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Lower Taxa
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Treatments in Other Floras @ www.efloras.org
Other Databases
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