1 74 GREENE 



for granted, never mentioning such a matter except in the cases 

 of those two or three of the new species in which there occurs a 

 trace of pubescence. 



Key to the Species. 



* Leaves deep or dark green above (except in Xo. 9), usually 

 white with bloom beneath, 

 f Panicles of fruit oblong, or oblong-fusiform. 

 Leaflets very many, 17—21 or more, and large. 



Leaflets oblong-lanceolate, obtuse at base and subsessile, at apex 



abruptly pointed 1. R. glabra. 



Leaflets oblong-lanceolate, sessile, slenderly long-pointed. 



2. R. oreophila. 

 Leaflets linear-lanceolate, sessile and auricled at base, at apex 



caudate-acuminate. 3. R. auriculata. 



Leaflets less numerous, commonly 13-17. 



Leaflets lance-oblong, tapering abruptlv at base and less abruptlv at 



apex 4 . R. tthacensis. 



Leaflets oval to oblong-lanceolate, merely acute at apex. 



5. R. ashei. 

 tt Fruiting panicles broadest near the base and pyramidal. 

 Leaflets rather few (except in Nos. 6 and S). 



Leaflets 17-21, sessile, oblong-lanceolate, acuminate. 



6. R. pyramidata. 

 Leaflets very large, but only 13-17, subsessile, acute rather than 



acuminate 7. R. caroliniana. 



Leaflets 19-23, narrowly oblong-lanceolate, obtuse at base, the apex 



subulate-linear S . R . atrovirens . 



Leaflets 13-17 and small, oblong-lanceolate, coarsely serrate, slend- 

 erly acuminate 9. R. ptdchella. 



Leaflets only 11-15, notably thin, attenuate-acute. 



10. R. ladoviciaiia . 

 Leaflets 11— 13, small but firm, subpetiolulate, abruptly but sharply 



acuminate.. 11. R. arbuscula. 



Leaflets 13-15, large, petiolulate, subfalcate, sharply acuminate. 



12. R. petiolata. 

 Leaflets 13-17, oblong-lanceolate, subpetiolulate, triangular-subulate 



at apex 13. R. valida. 



Leaflets 13-15, sessile by a rounded base, the apex short, slenderly 



attenuate 14. R. longula. 



Leaflets only 11-13 and small, sessile, subulate-acuminate, their 

 rachis pubescent 1^. R. sandbergii. 



