292 POLYGONACEAE 



Pa. Northampton and Montgomery counties. 



South of the moraine only in Pa. Nowhere very common, but 

 always increasing northward. 



2. P. Muhlenbergii (S. Wats) Small. In swamps and moist soil: 



Me. and Ont. to N. W. Terr, and B. C, south to Va., La. 



and Mo. 



Conn. Common along the Connecticut River and its tributaries, 

 elsewhere scarce. 



N. Y. L. I. and on S. I., thence increasing up the Hudson Valley 

 to Pine Plains, Dutchess Co. Nowhere common. 



N. J. Rare and local in Cape May, Gloucester, Atlantic and 

 Mercer counties, perhaps not wild in the pine-barrens, thence in- 

 creasing and more common northward. 



Pa. Luzerne, Northampton, Bucks, Delaware and Chester 

 counties. 

 Tertiary, rare or wanting: Cretaceous, more common: Older 



formations increasing and common northward. 123-220 days. 



Sea level-2,400 ft. 



3. P. lapathifolia (L.) S. F. Gray {Polygonum incarnatum Ell. P. 



tomentosum Schrank). In waste places: nearly throughout 

 N. Am. Naturalized from Eu. Native of Asia. 



Locally common in some of its forms over most of our area. 



4. P. pennsylvanica (L.) Small. In moist soil: N. S. to Ont., 



Minn., Fla. and Tex. 



Common as a weed throughout the region. 



5. P. portoricensis (Bertero) Small. In wet soil: S. N.J. and Mo. 



to Fla., Tex. and N. J. 

 N.J. Cape May Co. 



6. P. Persicaria (L.) Small. In waste places: throughout N. 



Am., except the extreme north. Naturalized from Europe. 

 Frequent as a weed in most parts of the range. 



7. P. Careyi (Olney) Greene. In wet soil: Me. and Ont. to 



Mich., south to R. I., N. J. and Pa. 



Conn. Litchfield, Hartford, New Haven and Fairfield counties. 



N. Y. The north side of L. I.; reported from Westchester Co., 



otherwise unknown. 

 N. J. Bergen, Essex, Morris and Hunterdon counties, increasing 



southward, but not common. 



