Ruhus ROSACEAE Ruhus 



R. argutus Link. (Incl. R. ostryifolius Rydb.) Highbush Black- 

 berry. 



Infrequent (or seldom collected), in open ground: railroad bank, 

 South wood (NC), R. R. Tatnall, 908, 3 June 1930 (T); Ocean City 

 (Wo), Redmond, 448, 8 June 1931 (US). Mid-May to mid- June. 



R. frondosus Bigel. Bush Blackberry. 



Frequent in woods, thickets and open ground, Piedmont, and 

 Coastal Plain southward to Sussex County. Mid-May to mid- 

 June. 



R. laciniatus Willd. Cut-leaved Blackberry. 



Escaping from cultivation, and frequently established in waste 

 places. New Castle County. June. 



R. procerus P. J. Muell. Himalaya-berry. 



Escaping from cultivation. One collection: well established on 

 roadside, Fredericktown (Ce), Commons, 13 June 1876 (A). Introd. 

 from Europe. 



R. cuneifolius Pursh. Sand Blackberry. 



Frequent in sandy soil of the Coastal Plain, Sussex County and 

 southward; one collection in upper Kent County (Del.): Smyrna, 

 Commons, 9 June 1894 (A). Late May, June. 



R. Enslenii Tratt. {R. villosus var. humifusus T. & G.) Dew- 

 berry. 



Common in fields and on roadsides. Mid-May to mid-June. 



^ R. flagellaris Willd. {R. procumhens Muhl. R. villosus Bailey.) 

 Dewberry. 



Common in dry, open ground. Piedmont and Coastal Plain. 

 Mid-May to mid-June. ^ <^ , ^ -y - ^ 



R. hispidus L. Swamp Dewberry. 



Common in swampy thickets and low ground in pine woods of 

 the Coastal Plain. June to early July. 



R. trivialis Mx. 



Rare, in pine woods of southern Northampton County : Fernald, 

 Long & Fogg, 5312, 14 Oct. 1935 (P, G). 



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