560 RYDBERG: Rocky MOUNTAIN FLORA 
305 in part; Stansbury Island, 1850, Stansbury ; Southern Utah, 
1877, E. Palmer 136. 
Cotorapo: Chicken Creek, 1898, Baker, Earle & 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. viridescens, 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 of P. Blachkeana, 
P. candida and P. flabelliformis. Yt 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. 
Cotorapo: Grizzly Creek, 1896, C. F. Baker (type) ; Doyle's, 
1901, 647; banks of Grizzly, 16 miles from Walden, 1894, 
Crandall 1224. 
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 ; SUP 
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 oF oval, 
usually obtuse, doubly serrate, glabrous on both sides or finely — 
puberulent and slightly paler beneath; flowers usually solitary, 
