SOME WESTERN ROSES. 133 



prickles all straight and spreading ; infrastipular spines none : 

 leaves of a livid bluish-green on both faces, but in age quite 

 glaucous, the rachis faintly short-villous, often with here and 

 there a small prickle, also a few small subsessile glands ; 

 stipules broad and entire, yet mostly revolute, thus seeming 

 narrow, those of vigorous growing shoots often closely beset 

 with sessile glands, but of older and flowering shoots gland- 

 less; leaflets of young shoots 9, of older ones 7, or even 5, 

 small, sessile, oval and oval-elliptic, finely serrate, smooth 

 and glabrous above, scarcely pubescent beneath except along 

 the midvein, and this only lightly so; but margins more loosely 

 villous : flowers corymbose ; peduncles and calyx-tube gla- 

 brous ; sepals marginally villous, the outside beset with many 

 sessile or subsessile glands : fruit rather large, depressed- 

 globose, orange-red. 



Open borders of woodland about Devil's Lake, North Da- 

 kota, collected by Dr. J. Lunell, 18 Aug., 1910. DiflFers from 

 -/?. heliophila in that (l) the whole plant is more glaucous, 

 (2) the prickles are far more numerous, more equal in size, 

 and far less firm, being hardly more than bristles, (3) leaflets 

 of less than half the size, (4) of elliptic and not obovate out- 

 line, (5) sepals glandular with subsessile glands. The species 

 is well isolated, geographically, from R. heliophila, which, 

 however, is on the prairies of South Dakota, and of North 

 Dakota, and with its own characters. 



Rosa Rydbergii. Stems erect, simple, less than a foot 

 high, densely leafy, rather loosely armed with short stoutish 

 straight and spreading prickles; infrastipular spines none: 

 leaves very glaucous above, of something approaching copperas- 



of bloom, the rachis beset 



green 



rather closely with short-stipulate and subsessile glands of 

 several sizes, also w4th a few stout short prickles ; stipules 

 entire as to the adnate part, this with, or more commonly 

 without villous marginal hairs, the few lobes conspicuously 

 crenate-serrate. e-labrous : leaflets 7, larere for the plant, very 





