286 Dioscoreacez. [ Dioscorea. 
Page 275.— 
1. DIOSCOREA Linn.* 
Tubers produced in a bunch; stem twining to 
the left; leaves simple, alternate, cordate 
pubescent beneath; male fis. 1-2-nate in a 
long spike-like raceme . : : : : D. esculenta. 
Tubers vertical : 
Stem twining to the left; seeds winged on 
one side only, in elongated, reflexed or 
horizontal capsules; Ivs. alternate : 
Leaves compound or rarely simple; peri- 
anth lobes just united at the base; 
male fis. in spikes or spike-like 
racemes : 
Leaves softly tomentose beneath . . I. D. TOMENTOSA. 
Leaves glabrous or sparsely hairy be- 
neath, : 2. D. PENTAPHYLLA. 
Leaves simple, ovate-cordate, glabrous; 
perianth-lobes free; male fils. in long 
dependent spikes : : ; : 
Stem twining to the right; seeds winged all 
round, in capsules which are not re- 
flexed but face forwards; leaves usually 
opposite; perianth-lobes free; male fis. 
sessile on short axes: 
Male fis. in axillary spikes and not on 
special leafless branches; stems not 
Winged : 
Leaves ovate or lanceolate : 
Network of veins very prominent : 
Leaves cuneate or cordate at base, 
alternate or opposite; capsule not 
acuminate : . : : «wae 
Leaves cuneate at base, opposite . 5. 
Network of veins not prominent; 
leaves opposite : 
Leaves hastate-cordate, glabrous; 
capsule acuminate . : : . 6. D. TRIMENII. 
Leaves cuneate at base; pubescent 
or glabrous; capsule not acumin- 
ate : : : : : = ye 
Leaves cuneately-obovate, opposite : 8. 
Male fis. in spikes arranged on elongated 
leafless branches which become zigzag 
when dry; stems usually winged; Ivs. 
hastate-cordate F : é D. alata. 
3. D. BULBIFERA. 
- SPICATA. 
. INTERMEDIA. 
whe, 
- OPPOSITIFOLIA. 
- OBCUNEATA. 
whe) 
D. Escutenta Burkill in Gard. Bull. Straits Settl. I, p. 396 (1917). 
Oncus esculentus Lour. Fl. Cochinch. p. 194 (1790). Dioscorea 
fasciculata Roxb. Hort. Beng. p. 72 (1814) nomen; FI. Ind., ed. 2, 
IT, p. 801 (1832). D. tiliefolia Kunth. Enum. V, p. 4o1 (1840). D. 
* After D. Prain and I. H. Burkill—A Synopsis of the Dioscoreas 
of the Old World, in Journ. As. Soc. Beng. X, pp. 5-41 (1914). 
Fart IV. 
