316 NORTH AMERICAN FLORA [VoLUME 22 
mm. long; sepals ovate, acuminate, 4-5 mm. long; petals broadly obcordate, slightly if at 
all exceeding the sepals; stamens about 20; pistils many; styles filiform. 
Type collected in the Bridger Mountains, Montana, in 1897, Rydberg & Bessey 4377 (herb. N. 
Y. Bot. Gard.). 
DISTRIBUTION : Mountains of Montana and Wyoming. 
49. Potentilla subvillosa Rydberg, sp. nov. 
Perennial, with ashort woody caudex; stems 2-3 dm. high, ascending, appressed-villous ; 
basal leaves digitately 5-7-foliolate; petioles 5-7 cm. long, appressed-villous; leaflets 
cuneate-obovate, about 3 cm. long, silky-villous above and loosely villous-tomentose beneath, 
more glabrate in age; stem-leaves few and reduced; inflorescence rather dense; hypan- 
thium villous, in fruit 6 mm. wide; bractlets oblong, about 3 mm. long; sepals lanceolate, 
about 5 mm. long; petals obcordate, 6-7 mm. long; stamens about 20; pistils many; styles 
filiform. 
Type collected at Carson Spur, Alpine County, California, in 1892, Geo. Hansen 297 (herb. N. 
Y. Bot. Gard.). 
50. Potentilla Bakeri Rydb. Bull. Torrey Club 31: 560. 1904. 
Potentilla gracilis S, Wats. Bot. King’s Expl. 88, in part. 1871. 
Perennial, with a short cespitose caudex ; stem 3-5 dm. high, usually decumbent at the 
base, loosely hirsute; basal leaves digitate, usually 7-foliolate; petioles 6-8 cm. long, loosely 
hirsute; leaflets oblanceolate, 3-5 cm. long, strongly veined, coarsely appressed-silky on 
both sides and more or less densely tomentose beneath, cleft about three fourths to the 
midrib into oblong, acutish or obtusish divisions; stem-leaves smaller, short-petioled, 5-folio- 
late or the upper 3-foliolate; inflorescence open, usually flat-topped; hypanthium and calyx 
silky-hirsute, the former 5-6 mm. broad in fruit; bractlets linear-lanceolate, about 3 mm. 
long and about half as long as the ovate or ovate-lanceolate, acuminate sepals ; petals obcor- 
date, a little exceeding the sepals; stamens 20; achenes smooth and shining; pistils many ; 
styles filiform. 
TYPE LOCALITY : Grizzly Creek, Colorado. 
DISTRIBUTION : Mountain valleys of Colorado, Wyoming, Utah, Nevada, and in California east 
of the Sierra Nevada. 
51. Potentilla comosa Rydberg, sp. nov. 
Perennial, with a short cespitose caudex; stem ascending or decumbent at the base, about 
3 dm. high, loosely white-hirsute; basal leaves digitately 5-7-foliolate; petioles conspicu- 
ously white-hirsute; leaflets obovate or elliptic, the larger 3 cm. long, deeply dissected two 
thirds to the midrib into oblong divisions, loosely hairy on both sides, almost white beneath ; 
lower stem-leaves 5-foliolate, similar to the basal ones, the upper 3-foliolate; inflorescence 
narrow and dense; hypanthium densely pubescent; bractlets lanceolate, 2 mm. long; 
sepals ovate, about 4 mm. long; petals rounded-obovate, yellow, about 4 mm. long. 
Type collected in Bear Valley, San Bernardino Mountains, in 1894, S. B. Parish 3152 (U. S. 
Nat. Herb. mo. 214369). 
XI. Pectinisectae. Rather tall, erect perennials. Leaves all 7-foliolate or some rarely 
9-foliolate ; leaflets divided to near the midrib into linear-oblong or linear-lanceolate divi- 
sions. Flowers large or middle-sized. Stamens about20. Pistils numerous; styles filiform. 
52. Potentilla pectinisecta Rydb. Bull. Torrey Club 24: 7. 1897. 
Perennial, with a short caudex; stem slender, 3-4 dm. high, ascending, finely silky- 
strigose or rarely hirsute; stipules ovate, often toothed ; leaves digitate, nearly all with 
5-9 leaflets, appressed-silky on both sides and sometimes slightly tomentulose beneath ; 
petioles of the basal leaves about 1 dm. long, silky-strigose ; those of the stem-leaves shorter ; 
leaflets obovate, deeply pectinately divided into oblong or linear segments; cyme rather 
dense; hypanthium appressed-silky, in fruit 6-7 mm. broad; bractlets linear-lanceolate, 
