3/6 ROSACEAE 



Hybridizes with 7?. argutus, frondosus, canadensis, Randii, 

 pergratus, Baileyanus, plicatijormis, procumbens, nigricans and 

 hispidus. 



12. R. alleghaniensis Porter. In thickets: N. S. to Ont., N. Y., 



Va. and N. Car. 



Known definitely only from Monroe, Carbon and Schuylkill 

 counties in Pa. and Union and Morris counties in N. J. 



13. R. argutus Link. (R. andrewisanus Blanch.). In fields: N. 



S. to mountains of N. Car., Kan. and Iowa. 



Common nearly throughout the area, less common in the pine- 

 barrens than elsewhere; not recorded from S. I. 



Hybridizes with R. frondosus, recurvans, Baileyanus, nigrobaccus, 

 nigricans, canadensis, procumbens, flagellaris, Enslenii and cunei- 

 folius. 



14. R. pergratus Blanchard. In mountains: Me. and Ont. to 



N. Y. and Iowa. 



Known in our range only from the Catskills in Greene and Dela- 

 ware Co., N. Y. and from Pike Co., Pa. 



Hybridizes with R. canadensis, procumbens, nigricans and 

 nigrobaccus. 



15. R. recurvans Blanchard. In thickets: Me. to Conn, and 



N. N. Y. 



Apparently rather common in Conn., but not definitely reported 

 from any other part of our range. 



Hybridizes with R. argutus, procumbens, geophilus, canadensis 

 and nigricans. 



16. R. frondosus Bigel. N. E. to Va. and Ohio. 



Throughout the range, except in the pine-barrens, there wanting; 

 very rare in the region immediately surrounding the pine-barrens. 



Hybridizes with R. nigrobaccus, argutus, procumbens, Baileyanus, 

 flagellaris, nigricans, hispidus and Enslenii. 



17. R. Randii (Bailey) Rydb. Woods: N. S. and Mass. to N. Y. 



and Pa. 



Known definitely only from Greene Co. in N. Y. and Pike, 

 Monroe and Northampton counties in Pa.; rare. 



Hybridizes with R. nigricans and nigrobaccus. 



