PI. 212. 



AN ORNAMENTAL TROPICAL YAM, DIOSCOREA SP., S. P. I. Xo. 38134. 



The ordinary cinnamon vine (Dioscorea batatas Decsne.) which is related to this speci< 

 produces such quantities of small aerial tubers resembling miniature potatoes, and these produ 

 such persistent vines that they are a veritable nuisance in a border. This large-leaved speci< 

 however, which produces aerial tubers as large as a good-sized potato, has distinct possibilities as 

 screen vine for porches and may prove valuable treated as an annual much above the frost lir 

 Photographed (P19630FS) by P. H. Dorsett at Miami Field Station, June 16, 1916. 



