Polygonum POLYGONACEAE Polygonum 



P. atlanticum (Robinson) Bicknell. 



Frequent on beaches and in tidal marshes along the Atlantic 

 coast of Kent (Del.) and Sussex Counties. Frt., Sept., Oct. 



P. Bellardi All. 



A waif on river shores and in waste places: Wilmington, Com- 

 mons, in 1897 and 1899 (A). 



P. tenue Mx. 



Frequent; sandy banks and fields, including serpentine soil. 

 Piedmont and Coastal Plain. Frt. mid-Aug., Sept. 



P. lapathifolium L. 



Frequent in New Castle County, in waste ground and on shores 

 of Delaware River; occasional farther south on the Coastal Plain: 

 Chestertown (Ke), Vanatta, 11 Aug. 1905 (A). Frt. Aug., Sept. 



P. densiflonim Meisn. 



Rare, in sandy soil of the seacoast: Lewes (S), Commons, 4 Aug. 

 1898 (A); Chincoteague Island (Ac), R. R. Tatnall, 130, 13 Sept. 

 1928 (T, P, G). 



P. natans A. Eaton. {P. amphibium of authors.) 



One collection: 5 mi. s. e. of Easton (Ta), Earle, 3069, 3 Sept. 

 1940 (P). Frt. late Aug., Sept. 



P. coccineum Muhl. (P. Muhlenhergii (Meisn.) Watson.) 



Infrequent, in swampy places on the Coastal Plain of New 

 Castle County. Frt. late Aug., Sept. 



P. pensylvanicum L. 



Common throughout; wet fields, waste ground, beaches and 

 salt marshes. Frt. mid-Aug. to Oct. 



Var. laevigatum Fern. 



Frequent from the Fall Line at least as far south as Worcester 

 County, in similar habitats. 



P. Careyi Olney. 



Rare, in moist soil: Georgetown (S), C. S. Williamson, in 1908 

 and 1909 (A); Georgetown, Long & Bartram, 5 July 1913 (A); 

 savanna 1 mi. n. of Georgetown, R. R. Tatnall, 4324, 8 Aug. 1939 

 (T, P). Frt., July, Aug. 



[107] 



