ROSACEAE 377 



1 8. R. canadensis L. Woods: Newf. to N. Car. and Mich. 



Confined so far as now known to the mountains of Ulster, Greene, 

 Columbia, Sullivan and Delaware counties, N. Y. and Monroe and 

 Luzerne counties in Pa. Locally very common. 



Hybridizes with R. sativus, nigrobaccus, argutus, recurvans, 

 Randii, pergratus, Baileyanus, procumbens, geophilus, plicatifolius, 

 nigricans and hispidus. 



19. R. invisus (Bailey) Britton. Conn, to Ont. and Ya. 



Credited to Conn, but not definitely known from the state, 

 otherwise unknown from the range. 



20. R. Baileyanus Britton. Mass. and Ont. to Va., Okl. and Kan. 



Common throughout the range, except in and near the pine- 

 barrens, there rare or wanting. 



Hybridizes with R. nigrobaccus, frondosus, procumbens, hispidus, 

 argutus, Enslenii, flagellar is, nigricans and canadensis. 



21. R. plicatifolius Blanchard. Me. and Ont. to the Catskills 



and Pa., also in Wise, and Minn. 



Known definitely only from the mountains in Greene Co., N. Y. 

 and Luzerne Co., Pa. 



Hybridizes with R. nigrobaccus, nigricans, canadensis and 

 hispidus. 



22. R. heterophyllus Willd. (R. geophilus Blanchard). On open 



ground: Me. to Mich., Conn, and N. J. 



Apparently not known on L. I. and S. I.; otherwise scattered, 

 but rare, over most of the range. 



Hybridizes with R. recurvans and canadensis. 



23. R. flagellaris Willd. Sandy plains: L. I. to Nantucket Island. 



Apparently localized on the coastal plain of L. I. 



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

 hispidus and Enslenii. 



24. R. procumbens Muhl. In dry soil: Newf. and Ont. to Lake 



Superior, Ya., La. and the Ind. Terr. 

 Common everywhere. 



Hybridizes with R. nigrobaccus, argutus, recurvans, pergratus, 

 frondosus, canadensis, hispidus, Enslenii, nigricans, Baileyanus 

 and flagellaris. 



