THE SWEET POTATO. 91 



Key West, ^^'ashington, D. C. 



Formula : 



A3 B2 CI D4 E2 Fl Gl H3 13 J2 K2. 



Steins very long, fg inch diameter or more at thickest point, bright 

 purple, but often green at the very base. 



Star large, extending up the veins; lower, surface of veins 

 strongly marked purple. 



Type leaf Fig. 53. 



Leaves often 6-8 inches broad; hair absent on ^-urface, present 

 along edge. 



•o 



Laiakona. Sandwich Islands. 



Formula : 



A3 Bl CI D4 El Fl Gl HI 12 J2 K3. 



Stems little more than 4 feet long, seldom more than % inch in 

 diameter, purple. 



Star small, lower surface of veins strongly marked purple. Hair 

 almost all over the upper surface of leaf. 



Type leaf Fig. 41. 



Nancy Hall. Louisiana. 



Formula : 



A5 B2 C2 Dl E2 Fl Gl HI 13 J3 K2. 



Stems less than 4 feet long, f^ to % inch in diameter, entirely 

 green. The plant has a bunch habit. Star plain, veins purple below. 

 Most leaves are slightly lobed on the sides, but ma«y are without 

 projections. 



Type leaf Fig. 74. 



Hair all over upper surface of loaf. 



Norton. Washington, D. C. 



Formula: 



A3 + 4 B2 CI Dl E2 F2 C;4 HI 12 -73 Kl. 



Stems long, -fs inch or more in diameter, green, with occasional 

 patches of brownish in exposed places. 



Hair very thickly covering the entire upper surface of the leaf. 

 Type leaf Fig. 64. 



