URTICACEAE 283 



1. U. dioica L. In waste places : Newf. to Ont., Minn., S. Car., 



Mo. and Colo. Naturalized from Europe. Native also of 

 Asia. 



Casual in most parts of our range, except in the pine-barrens, 

 there rare or wanting. 



2. U. gracilis Ait. In dry soil: Newf. to B. Col., N. Car., La. 



and Colo. 



Conn. Throughout the state, increasing northward. 

 N. Y. Not common on L. I. and S. I., becomig frequent in West- 

 chester Co. thence increasing and common northward. 

 N. J. Unknown in the pine-barrens; rare and local in Burlington, 

 Mercer and Middlesex counties, thence increasing and common 

 northward. 

 Pa. Northampton and Pike counties. 



Tertiary, o: Cretaceous, rare and local: Older Formations, in- 

 creasing northward. 120-210 days. Sea level-1,950 ft. 



3. U. urens L. In waste places: Newf. to N. Y., N. J. and Fla. 



Also on the Pacific Coast. Naturalized from Europe. 



A rare adventive. 



U. Lyallii S. Wats., a species confused with V. gracilis, has been credited to our range, 

 especially in Conn, and Pa.; it is omitted from the list because its specific and distribu- 

 tional status are open to question. 



2. Urticastrum Fabr. 

 1. U. divaricatum (L.) Kuntze. In rich woods: N. S. to Ont., 

 N. Dak., Minn., Fla. and Kan. 



Throughout the range, except in the pine-barrens, always in- 

 creasing northward. 



3. Pilea Lind (Adicea Raf.) 

 1. P. pumila (L.) A. Gray. In swampy shaded situations, often 

 on old logs: N. B. to Ont., Minn., Fla., La., Neb. and Kan. 

 Also in Japan. 



Throughout the range, except in the pine-barrens of N. J. and 

 L. I., there rare or wanting. 



4. Boehmeria Jacq. 



Leaf-blades leathery, finely serrate; petioles much shorter 



than the blades. I. B. Drummondiana. 



Leaf-blades relatively thin, coarsely serrate, petioles as long 



as the blades or a little shorter. 2. B. cvlindrka. 



