LEMNACEAE 215 



i. L. trisulca L. In water: N. S. to N. J., N. Mex., Brit. 

 Col. and Cal. Also in Europe, Asia, Africa and Australia. 

 Conn. Rare or wanting in the east, scattered along the coast, 



increasing northwestward. 

 N. Y. Clove Lake, S. I., increasing northward. 

 N. J. Hudson, Bergen, Essex, Passaic, Sussex and Morris counties, 



increasing northward. 

 Pa. Northampton, Lehigh, Monroe and Chester counties. 



2. L. cyclostasa (Ell.) Chev. In ponds and rivers: Mass. to Fla., 



111., Wyo. and Cal. Also in South America. 

 Conn. Along the coast, rare or wanting inland. 

 N. Y. Reported from L. I; S. I. 

 N. J. Bergen and Union counties. 



3. L. perpusilla Torr. In ponds, springs, rivers and lakes: N. Y. 



to Fla., Minn., Neb. and Kan. 



Conn. Reported but not definitely known from the state. 

 N. Y. Gardiner's I., L. I. and S. I. 



N. J. Bergen, Hudson and Atlantic counties, perhaps in the inter- 

 vening territory. 

 Pa. Northampton Co. (Porter). 



4. L. minor L. In ponds, lakes and stagnant pools, throughout 



North America except the extreme north. Also in Europe, 

 x<\sia, Africa and Australia. 



Throughout the range, but apparently rare in southeastern Conn, 

 and wanting in the pine-barrens. 



3. Wolffia Horkel. 



1. W. columbiana Karst. Floating as minute alga-like bodies 

 just beneath the surface of the water: Mass. to Ont., N. J., 

 S. Car., Minn., Mo. and La. Also in Mexico and South 

 America. 



Conn. Fairfield and Litchfield counties, increasing northward. 

 N. Y. Old Town Pond, S. I. and up the Hudson Valley to Greene 



and Delaware counties, increasing northward. 

 N. J. Passaic, Bergen, Camden and Salem counties, apparently not 



in the pine-barrens. 

 Pa. Philadelphia and Bucks counties. 



The reported occurrence of W. punctata Griseb. in Pa. has not been satisfactorily 

 established. 



