CONVOLVULACEAE. 



301 



5. Ipomoea sagittata Lam. Ar- 

 row-leaved MORXIXG-GLORY. (Fig. 

 320.) Perennial, glabrous. Stems 

 twining, 6°-15° long, branching, rela- 

 tively slender. Leaves l^''-4' long, 

 sagittate or hastate-sagittate, the seg- 

 ments linear or lanceolate, the lateral 

 about i as long as the terminal one; 

 petioles about as long as the basal 

 lobes; peduncles usually 1-flowered; 

 sepals glabrous, oblong to suborbieu- 

 lar, 3"-4" long, obtuse or cuspidate; 

 corolla purple, about 2' long, the tube 

 funnelform, the limb 2'-3' broad; 

 capsules ovoid, 5"-7" long; seeds vil- 

 lous. [Convolvulus sagittifolius Michx. ; 

 Ipomoea sagittifolia Ker.] 



Occasional in fresh-water marshes ; abundant in Warwick Marsh. Native. 

 Southern United States and Bahamas. Flowers from spring to autumn. Its seeds 

 probably reached Bermuda on the wind. 



6. Ipomoea Batatas (L.) Lam. 

 Sweet Potato. (Fig. 321.) Eoot- 

 stocks large, fleshv, the well-known 

 vegetable. Stems glabrous or 

 nearly so, trailing, 3° long or 

 longer; leaf -blades various, ovate 

 to suborbicular, entire, dentate or 

 lobed, acuminate to obtuse, cor- 

 date at the base, 2'-6' long; pe- 

 duncles as long as the petioles or 

 shorter, few-flowered; sepals ob- 

 long, acute, cuspidate, somewhat 

 unequal, 3^"-o" long; corolla pale 

 purple or nearly white, about 2' 

 long; ovary and capsule 2-celled; 

 seeds smooth. [Convolvulus Ba- 

 tatas L. ; Convolvulus edulis 

 Thunb.; Batatas edulis Choisy.] 



Waste places, and persistent after cultivation. Introduced. Native habitat 

 unknown. 



The sweet-potato is cultivated, in a large number of different races, in all 

 warm-temperate and tropical regions, and is one of the important crops of 

 Bermuda. 



