560 Rydberg : Rocky Mountain flora 



joj in part; Stansbury Island, 1850, Stansbnvy ; Southern Utah, 

 1877, E. Palmer ij6. 



Colorado: Chicken Creek, 1898, Baker, Earlc & Tracy 

 863. 



Potentilla Bakeri sp. nov. 



Perennial ; stem rather stout, about 4 dm. high, rather loosely- 

 hirsute, branched ; basal leaves usually digitately 7-foliolate ; 

 petioles 6-8 cm. long, loosely hirsute ; leaflets oblanceolate, 3-5 

 cm. long, strongly veined, coarsely silky on both sides and slightly 

 grayish tomentose beneath, cleft to about three-fourth to the mid- 

 rib into oblong acute lobes ; stem-leaves similar but smaller and 

 short-petioled, usually only 5-foliolate or the upper 3-foliolate ; in- 

 florescence open, usually flat-topped and corymbiform ; hypan- 

 thium and calyx silky-hirsute and slightly tomentulose ; bractlets 

 linear-lanceolate, about 3 mm. long and half as long as the ovate 

 or ovate-lanceolate acuminate sepals ; petals obcordate, a little ex- 

 ceeding the sepals ; stamens about 20 ; achenes smooth and shin- 

 ing ; style filiform. 



In my monograph I included the only specimen then at hand 

 in P. viridescciis, but it has deeper dissected leaves and more 

 spreading pubescence than that species. Specimens of the present 

 species are found in collections under the name oi P. Blachkea^ia, 

 P. Candida and P. flabelliformis. It can, however, not well be 

 confounded with any of these, except perhaps P. Candida, which 

 it resembles in general habit and leaf-form. P. Candida is, how- 

 ever, a small plant with leaves intensely white on both sides. P. 

 Bakeri grows at an altitude of 2,100-2,700 m. 



Colorado : Grizzly Creek, 1896, C. F. Baker (type) ; Doyle's, 

 1 90 1, 6^j ; banks of Grizzly, 16 miles from Walden, 1894, 

 Craiidall 122^. 



Rosa Underwoodii sp. nov. 



Shrub, 1-2 m. high ; bark of the old stems gray ; that of 

 preceding year's branches purplish and of the new twigs purplish 

 or green ; prickles infrastipular and scattered, strongly curved, 

 7-10 mm. long, with an oblanceolate base, 5-10 mm. long; stip- 

 ules narrow, the lanceolate free portion about 5 mm. long, gland- 

 ular-dentate ; leaves 5-10 cm. long; petiole and rachis puberulent 

 and with sessile glands ; leaflets 2-4 cm. long, obovate or oval, 

 usually obtuse, doubly serrate, glabrous on both sides or finely 

 puberulent and slightly paler beneath ; flowers usually solitary ; 



