Pontederia 



PONTEDERIACEAE 



287 



Map 594 

 I radescantia subaspera Ker 

 var typica Anderson & Woodson 



o 53 



Map 596 



Pontederia cordata L 



records or specimens. It is a woodland species and is rarely found in the 

 open. It prefers the moist, rich, wooded terrace slopes along streams and 

 the slopes of ravines and is less frequent in level woods. 

 Pa. to Kans., southw. to Fla. and La. 



3. Tradescantia virginiana L. Virginia Spiderwort. Map 595. Infre- 

 quent but well distributed in the southern two thirds of the state, becoming 

 less frequent to very rare in the northern counties. This is a woodland 

 species and is rarely found in the open. It is usually found in dry clayey 

 soil in white oak, white oak and black oak, and beech and sugar maple 

 woods. White and rose colored forms are sometimes found and they 

 persist under cultivation. 



Southern N. Y. to S. Dak., southw. to Va., Ky., and Ark. 



34. PONTEDERIACEAE Dumort. Pickerelweed Family 



[Moldenke. Pontederiaceae of North America. N. Amer. Flora 19: 

 51-60. 1937.] 



Plants erect; leaves large, cordate to lanceolate; flowers blue, 2-lipped; stamens 6; 



utricle 1-seeded 922. Pontederia, p. 287. 



Plants floating or prostrate on mud; leaves linear, very narrow or reniform; flowers 



yellow, white or pale blue; perianth salver-shaped; stamens 3; capsule many-seeded. 



924. Heteranthera, p. 288. 



922/ PONTEDERIA L. 



[Fernald (Rhodora 27: 80. 1925) gives a key to the "Pontederias of 

 temperate North America," which is copied here in part.] 



Leaves cordate at base. 



Leaves narrowly deltoid-ovate, tapering with straight sides from the base to the 



apex 1. p. cordata. 



Leaves broadly ovate, gradually curved from the broad base to the blunt summit 



la. P. cordata f. latifolia. 



Leaves truncate to tapering at base, narrowly deltoid to linear-lanceolate 



lb. P. cordata f. angustifolia. 



