PONTEDERIACEAE 2IO. 



Spathe with united base. 



All the cavities of the ovary with 2 ovules. 



Capsules 2-valved, dorsal cavities indehiscent. 3. C. virginica. 



Capsules 3-valved, all cavities dehiscent. 4. C. erecta. 



Ventral cavities of the ovary with 2 ovules, dorsal cavity with 



1 ovule. 4- C. hirtella. 



i. C. nudiflora L. Along streams and in waste places: N. J. to 

 Ind. and Mo., south to Fla. and Tex.; and through tropical 

 America to Paraguay. Also in Europe and Asia. 

 Rare as a weed. 



2. C. communis L. In waste places: Conn, and eastern Pa. 



to Ga. and Ky. Adventive or naturalized from Asia. 

 Locally abundant as a weed. 



3. C. virginica L. S. N. Y. to 111. and Mich., south to Fla., Nev. 



and Tex. ; and through tropical America to Paraguay. 

 N. Y. Near N. Y. City, and recorded from S. I. 

 N. J. Burlington Co. 



4. C. erecta L. In moist soil: S. N. Y. to Fla., Tex. and tropical 



Am. 



Known only from Camden, N. J., and from N. Y. City, probably 

 adventive from the south. 



5. C. hirtella Vahl. In moist soil: S. N. J. to Fla. and Tex. 



Known definitely only from Kaighn's Point, Camden Co., N. J. 

 Not recently collected. 



2. Tradescantia L. 

 I. T. virginiana L. S. N. Y. to Ohio and S. Dak., south to Va., 

 Ky. and Ark. Escaped from cultivation in N. E. 



Locally abundant as a weed; rare in our range as a wild plant, 

 but wild in the valley of the Delaware from Trenton northward. 



T. reflexa Raf., a southern species, has been collected as a waif in Conn. 



PONTEDERIACEAE* 



Flowers 2-lipped; stamens 6; fruit a i-seeded utricle. I. Pontederia. 



Flowers regular; stamens 3; fruit a many-seeded capsule. 2. Heteranthera. 



i. Pontederia L. 



1. P. cordata L. Ponds and streams: Nov. Scot, to Minn., Fla. 

 and Tex. 



* See footnote, page 76. 



