THE SWEET POTATO. 93 



Leav€3 range from light yellowish-green to rather dark green 

 on the upper surface. 



The largest leaves on long stems are the darkest. 



Type leaf Fig. 47. 



Hairs absent from upper surface of leaf, present on the edge. 



Pu. Sandwich Islands. 



Formula : 



A4 B2 C2 D4 E2 F2 G2-3 H3 12 J3 K3. 



Stems about 2 feet, ^ inch thick, pinkish-purple. Leaves, which 

 are on purplish petioles, have the lower surface of the midrib with a 

 hue of pink. Sometimes there is a purplish spot at the base of 

 the midrib on the lower surface. 



Type leaf Fig. 61. 



Pumpkin. Various States of the Union. 



Formula : 



A4 -f 3 Bl CI Dl El F2 G4 HI 13 J4 K2, 



Stems long, % inch in diameter, green, with occasional brownish 

 places, where exposed to the sun. Exceptionally a few leaves have 

 a hue of pink on the lower side of the midrib. 



Hair thick all over upper surface. 



Type leaf Fig. 65. 



Red Jersey. Washington, D. C. 



Formula : 



A5 Bl CI Dl El F2 G3 Hl-2 14 J2 K2. 



Stems long, less than % inch in diameter, green, brownish in 

 patches. 



A purplish spot on the under side of the base of the midrib. 

 Leaves rarely more than 3 inches across, both round and lobed. 



Hairs all over young open leaves, but chiefly on the veins in the 

 oldest ones. 



Type leaf Fig. 68. 



