MONOCOTYLES. 
89 
large, emarginate at base, leaves pale beneath. 
This tropical Genus extending to N. America 
has there many more sp. only two were known, 
I shall add 6, they have all perennial thick roots 
called yams. 
476. Dioscorea hexaphylla Raf. erect, 
leaves whorled by 6 on very long petiols, sub- 
cordate shortly acuminate smooth glaucous be- 
neath with 11 fulvous nerves, spikes whorled 
ramose filiform, flowers often geminate — -Apal- 
achian Mts. of Virginia, stem rigid brown tri- 
pedal. Near to D. quaternata, first leaves op- 
posite. 
477. Dioscorea repanda Raf stem flexuose 
scandent, leaves whorled by 4 below, alternate 
above, petiols equal to leaves filiform silicate 
hairy above, leaves smooth ovate acuminate 
base reniform, margin repand, beneath glau- 
cous 11 nerved, spikes short, capsules small fus- 
cate — Virginia and Alabama in hills, leaves 
large truly repand hardly cordate, apex falcate 
acuminate. 
478. Dioscorea longifolia Raf. scandent, 
leaves ovatoblong base deeply cordate, lobes 
elongate proximate, apex acuminate, smooth 
concolor 5nerved, lateral forked — sent me from 
Alabama without flowers, leaves 6 inches long 
3 broad. 
479. Dioscorea sativa L. cult, in Florida, 
and perhaps wild also. 
480. Dioscorea btjlbifera L. The sp. was 
found at Mobile by Bar tram (tray. p. 439) cul- 
tivated 60 years ago. It is remarkable by the 
large kidney bulbs 1 to 3 together axillary of 
leaves, tasting like the Yam root. My speci- 
mens have large cordate leaves 8 to 10 inches 
long, quite smooth acum. with 7 nerves lateral 
forked. 12 
