218 COMMELINACEAE 



N. J. Ocean and Burlington counties, increasing and common 

 southward, predominating in the pine-barrens. 



Pa. Reported from the state, but not definitely known from our 

 area. 

 Tertiary common : Cretaceous, scattered in edaphically favorable 



situations:* Older Formations, o. Not north of the moraine. 168- 



220 days. About sea level. 



2. E. compressum Lam. In still shallow water and in swamps: 



S. N. J. to Fla. and Tex. Also in Cuba. 



N. J. Ocean and Burlington counties, increasing and common 



southward, predominating in the pine-barrens. 



Tertiary, common: Cretaceous, not definitely known; Older 

 Formations, o. Not north of the moraine. 168-220 days. About 

 sea level. 



3. E. septangulare L. In still waters or on shores: Newf. to 



Ont., Minn., Fla. and Tex. Also in western Europe. 



Conn. Rare or local over most of the state, increasing south- 

 eastward . 



N. Y. Dutchess and Putnam counties, increasing southward and 

 common on L. I. Not recorded from S. I. 



N. J. Throughout, local in the north, increasing and common 

 southward. 



Pa. Pike, Luzerne, Lackawanna, Monroe, Carbon, Bucks and 

 Philadelphia counties. 

 Apparently indifferent as to geological formation. 117-220 



days. Sea level-750 ft. 



4. E. Parkeri B. L. Robinson. In tidal mud: southern N. J., 



adjacent Pa., and from near Washington, D. C. 



Burlington and Camden counties, N. J., and at Mullica River 

 above Crowleytown along the coast. 



COMMELINACEAE 



Perfect stamens 3 or rarely 2; petals unequal; bracts spathe-like. I. Commelina. 

 Perfect stamens 6 or rarely 5; petals all alike; bracts leaf-like. 2. Tradescantia. 



i. Commelina L. 



Spathe not united at the base. 



Spathe acuminate; capsules 3-celled, 5-seeded. 1. C. nudiflora. 



Spathe acute; capsules 2-celled, 4-seeded. 2. C. communis 



* See Introduction paragraph 29. 



