252 . DIOSCOREACEZ. [ Drosconna. 
Stems twining to the right; seeds with the 
wing developed all round :— 
Section ENANTIOPHYLLUM. ‘Tubers vertical, 
usually edible. Leaves simple. Male 
flowers sessile, on short axes, opening but 
a little way ; perianth-lobes-free, with the 
stamens inserted at their bases ; filaments 
simple. Seeds in capsules which are not 
reflexed but face forwards :— 
Male flowers in spikes arranged on elongate 
leafless branches :— 
Flowers of male plant on axes which 
are never zigzag alive or dry; buds 
usually flattened at the base :— 
Special flowering branches conspicu- 
ously shorter than the leaves ; cap- 
sules often rather glaucous . . bd. D. Wallichii. 
Special flowering branches, when well- 
grown, longer than the leaves :— 
Pubescence abundant on the leaf- 
less axes which bear the spikes 
of the closely packed male 
flowers which are covered with 
hairs, stamens 6 : . 6. D. anguina. 
Pubescence absent entirely :— 
Leaves hastate, network con- 
Spicuous below. . : . 7. D. belophylla. 
Leaves cordate or ovate-cordate, 
thin, curling up on the midrib 
when drying; the first lateral 
pair of nerves rather close to 
the midrib . : ' . 8 D. glabra. 
Flowers of male plant on axes which 
become zigzag either in life or when 
dry ; stems acutely angled or winged 9. D. alata. 
Section COMBILIUM. 
1 D. aculeatas Linn. Amen. Acad. iv (1754), 131; Prain 
and Burkill in Journ. As. Soc. Beng. (N.S.), Vol. x (1914); D.- 
