Rumex POLYGONACEAE Polygonum 



R. obtusifolius L. Bitter Dock. 



Common weed in waste places. June, July. Introd. from 

 Europe. 



R. pulcher L. 



Rare, in waste ground and coastal sands, chiefly southward: 

 waste ground, Wilmington, Commons, 9 July 1898 (A, D); waste 

 ground, Accomac, R. R. Tatnall, 42, 31 May 1928 (T), and 335, 

 1 June 1929 (G); beach sand at Cape Charles City (No), R. R. 

 Tatnall, 1776, 27 May 1933 (T, P, G). May, June. 



R. hastatulus Baldw. 



On coastal sands; one collection: Wallops Island (Ac), McAtee 

 in 1913 (U). 



|( / R. Acetosella L. Sheep Sorrel. 



A common weed in fields and waste places. May, June. Nat. 

 from Europe. C* i /^«.-v^\ 



Polygonum L. Knotweed. Smartweed. 



' P. glaucum Nutt. (P. maritimum L.) Seaside Knotweed. 

 Frequent on beaches of the Atlantic coast. July. 



P. prolificum (Small) Robinson. 



Frequent on beaches and borders of salt marshes. Frt., Aug., 

 Sept. 



P. aviculare L. Door Weed. 



A common weed in door-yards, foot paths and waste places. 

 Frt., late Aug, to Oct. 



P. neglectum Besser. (P. aviculare var. angusiissimum Meisn.) 



Rare: Elk Neck (Ce), E. C. and G. M. Leonard, 5710, 12 Sept. 

 1925 (U); fields, Chincoteague Island (Ac), M. T. Travis, 681, 23 

 July 1938 (P). 



P. erectum L. 



Frequent but not often collected; in cultivated ground and waste 

 places. Frt., Aug., Sept. 



P. ramosissimum Mx. 



Infrequent, in sandy soil near the coast. Frt., Sept., Oct. 



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