ROSACEAE 371 



7. G. rivale L. In swamps and low grounds: Lab. and Newf. to 

 N. J., Mo., N. Mex. and B. Col. Also in Europe and Asia. 

 Conn. Rare near the coast, increasing and becoming common 



northward. 

 N. Y. Unknown south of the Highlands of the Hudson, thence 



increasing northward. 

 N. J. Bergen, Passaic, Morris and Warren counties, increasing 



northward. 

 Pa. Wayne, Monroe, Northampton and Chester counties. 



Tertiary, o: Cretaceous, o: Older Formations, increasing north- 

 ward. Predominating north of the moraine. 118-220 days. Sea 

 level-3,365 ft. 

 This species is supposed to hybridize with G. strictum and the 

 hybrid is to be looked for wherever both the supposed paruits 

 occur. 



G. macrophyllum Welld. a far northern species, has been erroneously reported from 

 Bucks Co., Pa. The specimen on which the report was based is G. virginianum. 



19. Waldsteinia Willd. 



1. W. fragarioides (Michx.) Tratt. Woods and shaded hillsides: 

 N. Eng. and Ont. to Minn., Mich., Ind. and along the 

 Alleghanies to Ga. 

 Conn. Northern Litchfield Co. 



N. Y. Ulster, Sullivan, Dutchess, Delaware and Greene counties. 

 N. J. Sussex Co. 

 Pa. Bucks, Monroe, Northampton and Schuylkill counties. 



Tertiary, o: Cretaceous, 0: Older Formations, increasing north- 

 ward. 1 17-158 days. 800-4,020 ft. 



20. Rubus [Tourn.] L.* 



I. Leaves simple, crenate or palmately lobed. 



Shrubby; flowers corymbose, purple. I. R. odoralus. 



Herbaceous; flower solitary, white. 2. R. Chamaemorus. 



II. Leaves 3-7 foliolate. 



Stem herbaceous, never prickly, rarely bristly. 3. R. pubescens. 



Stems more or less woody, biennial or perennial, usually 

 prickly. 

 Carpels united into a thimble-shaped aggregate fruit, 

 falling off from the dry receptacle. 



* Adapted, with the aid of Dr. P. A. Rydberg, from his treatment in North American 

 Flora. Because of the uncertainty of specific limitations, the many hybrids, and the 

 writer's lack of familiarity with the group, it has seemed wise to omit phytogeographical 

 and ecological data. 



