THE SWEET POTATO. 85 



The writer wishes it to be clearly understood that 

 lie elaborated the key for the convenience of workers 

 in this field, and that therefore he welcomes criti- 

 cisms and corrections. 



For sweet i^otato material the writer feels espec- 

 ially indebted to Mr. ]^eattie, of the Washington 

 Experiment Station; Mr. Starnes, of the Georgia 

 Station; Mr. Bnrnette, of the Baton Kouge Station; 

 Mr. Rosa, of Milford, Delaware; Mr. Pittier, of 

 Washington, and to the Botanic Gardens of Jamaica, 

 ]»arbadoes, Calcutta, Mauritius, and Honohilu. The 

 writer wishes to express his sincere thanks to Dr. 

 Macfarlane for the facilities for study olfered in the 

 ]^otanic Gardens of the University and the many sug- 

 gestions made; to Mr. Trouncer, of Wenonah, N. J., 

 for the generous otfer of his field, and to Mr. Maisch, 

 l^hotographer of the Philadelphia Museums, for the 

 care he has taken with the photographs. 



F. Desceiptions. 



Alabama (Georgia). Southern States. 

 Formula : 



A5 Bl-2 CI D4 El-2 Fl Gl H2 11-2 J2 K2. 



Stems long, between % and ^ inch thick, bright light purple. 



Star clear, but small. Lower surface of veinss dark purple. Hair 

 chiefly along the veins, scant. 



Type leaf Fig. 71. 



Differs from Early General Grant only in its less vigorous growth. 



Belmont. Washington. United States. 

 Formula : 



Al B2 CI Dl El F2 G4 HI 13 J3 Kl. 



Stems thin, about ^^ of an inch in diameter, green. Often broAvnish 

 or even faintly purplish where exposed to the sun. Hairy. 



Large grown leaves, about 4-4^^ inches across from tip to tip. 



Type leaf figure omitted by mistake, resembles Georgia very 

 closely. 



