MONOCOTYLES. 89 



large, cmarginate 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 1 1 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 sulcate 

 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 BULBIFERA L. The sp. was 

 found at Mobile by Bartram (trav. 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 a cum. with 7 nerves lateral 

 forked. 12 





