Vol. X, No. 1.] The Dioscoreas of the Obi World. 7 



[N.S.] 



Plant not drying black. 

 Edge of leaves not wavy. 



Leaves relatively small . . . . 26. Morsel. 



Leaves up to 20 cm. long . . . . 27. hypoglattea. 



Edge of leaves very wavy . . . . 28. graciUima. 



Section 3. Shannicorea. Tubers as far as known de- 

 scending vertically. Stem twining to the left. Leaves simple, 

 cordate. Male flowers in abbreviated distorted racemes which 

 look like small scorpioid cymes, placed along the axis of a 

 spike-like raceme : perianth saucer-shaped , the stamens inserted 

 near the margin of its tubular part: filaments simple. Seeds 

 with the wing developed on one side only, in elongated reflexed 

 capsules. 



Leaves as broad as or broader than long. 

 Loaves with numerous hairs. 



Leaves larger, with white tomentum . . 29. ijunnanensis. 



Leaves smaller, with brown hairs . . . . 30. Hemsleyi. 



Leaves with no hairs . . . . . . 31. subcalva. 



Leaves elongated so that they are longer than broad. 



Plant with very sparse hairs . . . . 32. nitens. 



Plant with rather abundant white hairs . . 33. Martini. 



Plant with plentiful tawny hairs .. .. 34. velutipes. 



Section 4. Combilium. Tubers produced in a bunch , 

 spreading, edible. Stem twining to the left. Leaves simple, 

 cordate. Male flowers 1-2 together on a long spike-like raceme 

 (when the second flower is present it is placed cymosely on the 

 pedicel of the first) : perianth saucer-shaped, the stamens in- 



serted near its margin. Seeds unknown. 



Only species 



35. acideata. 



Section 5. Lasiophyton. Tubers vertical, containing 

 dioscorine in varying quantity. Stem twining to the left 

 Leaves generally compound, but not always. Male flowers in 

 spikes or spike like racemes which are generally compound: 

 perianth-lobes just united at the base, with the stamens insert- 

 ed on them : filaments simple. Seeds winged on one side only, 

 in elongated reflexed or horizontal capsules. 



Male flowers not very densely packed : stamens 3. 

 Leaves simple 

 Leaves simple and compound : hair as abundant 



grey tomentum . . . . . . 37. tomentosa. 



Leaves compound or if any simple leaves are pre- 

 sent, they are small ones among the flowers. 

 Capsules at maturity reflexed on the pendulous 

 axis 

 Capsule not more than 18 mm. long. 



Leaflets relatively small, up to 10 cm. long. 

 Tubers several, on long slender rather 



divergent stalks . . . . 38. Arachidna. 



Tubers single or few, not on long stalks. 



36. Kerr ii. 



