374 ROSACEAE 



Leaflets thick, dark green, dull; 



leaves of inflorescence often uni- 



foliolate. 23. R. flagellaris. 



Leaflets light green, shining above; 



leaves of the inflorescence rarely 



unifoliolate. 24. R. procumbens. 



Leaflets of floral branches crenate-ser- 



rate, with ovate teeth. 25. R. Enslenii. 



B. Stem with usually numerous bristles, not confined 

 to the angles. 

 Stem at first erect or ascending; leaflets of 

 suckers acute or acuminate at the apex, 

 not evergreen. 

 Inflorescence corymbiform, short and 



broad. 26. R. nigricans. 



Inflorescence racemiform, simple. 27. R. setosus. 



Stem prostrate from the beginning; leaflets of 

 suckers obtuse or rounded at apex, half- 

 evergreen. 28. R. hispidus. 



i. R. odoratus L. (Rubacer odoratum (L.) Rydb.). In rocky 

 woods: N. S. to Ont., Mich., Ga. and Tenn. 

 Conn. Rare or wanting near the coast, increasing northwestward. 

 N. Y. Roslyn, L. I. Unknown on S. I.; rare and local in Bronx 



and Westchester counties, thence increasing northward. 

 N. J. Rare in LInion, Essex, and Hudson counties, increasing 



northward. 

 Pa. Throughout the area. 



2. R. Chamaemorus L. Arctic Am. and Greenland to N. Hamp. 



and N. Y., west to Alask., B. Col. Also in Eu. and Asia. 



Localized in our area at Montauk Point, L. I., there presumably 

 introduced by birds. 



3. R. pubescens Raf. (R. americanns Britton). Swamps and 



damp woods: Newf. to N. J., Iowa, Mont., B. Col., also in 



Colo. 



Conn. Rare near the east coast, increasing northward. 



N. Y. Unknown on L. I. or S. I.; rare in Westchester and Bronx 

 counties, thence increasing northward. 



N. J. Hudson, Essex, and Hunterdon counties, increasing north- 

 ward. 



Pa. Pike, Monroe, Luzerne, Northampton and Bucks counties. 



4. R. phoenicolasius Maxim. Escaped from cultivation in E. 



U. S. Native of Japan and China. 

 A rare garden escape, occasionally persistent in our area. 



