Polygonum POLYGONACEAE Polygonum 



P. Hydropiper L. var. projectum Stanford. Water Pepper. 



Infrequent; low ground and vacant city lots, New Castle 

 County. 



P. punctatum Ell. (P. acre HBK. in part.) 



Common throughout, in woods, and on beaches and roadsides. 

 Frt., late July to Sept. 



P. robustius (Small) Fernald. (P. punctatum var. rohustius Small.) 

 Rare, in swampy ground: tidal shore of Long Creek, 1 mi. n. of 

 Chesapeake City (Ce), Long, 41118, 15 July 1933 (A); same place 

 and date, R. R. Tatnall, 1926 (T) ; swamp 1 mi. s. of Church Creek 

 (Do), C. P. Reed, 550, 27 Aug. 1939 (U). 



P. orientale L. Prince's Feather. 



A frequent escape from gardens. Introd. from India. 



H P. Persicaria L. Lady's Thumb. 



Common in low ground. Frt., mid-Aug., Sept. Nat. from 

 Europe. 



P. longisetum DeBruyn. (See S. F. Blake: Rhodora 34, 146. 1932.) 



Rather recently introduced from Asia, and spreading in New 

 Castle and Cecil Counties. Fl. mid-Sept., early Oct. 



P. opelousanum Riddell. 



Infrequent in ditches and wet thickets on the Coastal Plain. 



P. setaceum Baldwin. 



One collection: wet ditch 2 mi. n. of Georgetown (S), Fogg, 

 4479, 19 July 1932 (P). 



P. hydropiperoides Mx. Mild Water Pepper. 

 Common in wet places. Frt. late July to Sept. 



P. arifolium L. (Halberd-leaved Tear Thumb.) 



Common throughout, in wet places. Frt. late Aug. to Oct; 



P. sagittatum L, Arrow-leaved Tear Thumb. 



Common throughout, in wet places. Frt. mid-Aug. to Sept. 



P. Convolvulus L. Black Bindweed. 



Frequent in waste places. Nat. from Europe. 



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