340 NORTH AMERICAN FLORA [VoLuME 22 
which are about 4 thm. long; petals obcordate, scarcely exceeding the sepals; stamens about 
20; pistils 10-15 (rarely 20); styles filiform. 
TYPE LOCALITY: South Park, Colorado. 
DISTRIBUTION: Mountains of Colorado and Wyoming. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: p/. 52. 
134. Potentilla rupincola Osterhout, Bull. Torrey Club 
. 26: 256. 1899. 
Perennial, with a branching caudex; stems slender, 2-3 dm. high, glabrous except for 
a few stiff, pointed hairs, erect or nearly so; basal leaves numerous, 6-10 cm. long, inter- 
rupted-pinnate; petioles 1-3 cm. long, sparingly strigose; leaflets 5~7, narrowly cuneate, 
1-1.5 cm. long, sharply serrate above, glabrous, except the ribs and margins, which are 
slightly ciliate; stem-leaves smaller and with fewer leaflets; stipules lanceolate; cyme 
several-flowered, more or less tomentose; hypanthium tomentose, in fruit 3-4 mm. wide; 
bractlets linear-subulate, half as long as the narrowly lanceolate, acuminate sepals, which 
are 3-4 mm. long; petals broadly obovate, retuse, about the length of the sepals; stamens 
18-20; pistils about 6; styles filiform. 
TYPE LOCALITY: Dale Creek, Larimer County, Colorado. 
DISTRIBUTION: Mountains of northern Colorado. 
135. Potentilla effusa Dougl.; Lehm. Stirp. Pug. 2: 8. 1830. 
Perennial, with a tap-root and short caudex; stems many, 24 dm. high, slightly 
silky, ascending or diffuse, dichotomously paniculately branched with spreading-ascending 
branches; stipules lanceolate, subentire; basal leaves many, with slender petioles 2-5 cm. 
long, usually interruptedly pinnate with 5-11 leaflets; stem-leaves often 1-3-foliolate, 
grayish-tomentose on both sides; leaflets cuneate-oblong or oblanceolate, the upper often 
confluent, crenate with broad usually ovate teeth; flowers paniculate-cymose; bractlets 
linear or linear-lanceolate, usually much shorter than the lanceolate-acuminate sepals, 
which are 4-5 mm. long; petals obovate, retuse, a little longer than the calyx.; stamens 
20; pistils 20-40; styles filiform. 
TYPE LOCALITY: [Not given in the original publication, but supplied in Hooker’s Flora.] 
Elevated grounds of the Assiniboine. 
DISTRIBUTION : Plains and hills from Saskatchewan and Alberta to Nebraska and New Mexico. 
ILLUSTRATIONS: Lehm. Rev. Potent. pl. 22; Britt. & Brown, Ill. Fl. f. 7928; Mem. Dep. 
Bot. Columbia Univ. 2: £1. 41, f. 3-4. ; 
136. Potentilla lupina Rydberg, sp. nov. 
Perennial, with a short caudex; stem 3-4 dm. high, nearly erect, densely grayish- 
pubescent with coarse ascending hairs; basal leaves pinnate with about 7 approximate 
leaflets; petioles 5-7 cm. long, grayish-pubescent like the stem; leaflets oblanceolate, 2-5 
em. long, coarsely crenate with ovate teeth, densely grayish-pubescent on both sides with 
rather coarse appressed hairs and tomentulose beneath; stem-leaves similar but smaller, 
short-petioled and only 3-5-foliolate ; cyme open, with about a dozen flowers; hypanthium 
villous-hirsute, in fruit 7 mm. broad; bractlets lanceolate, about 3 mm. long; sepals lance- 
ovate, acuminate, 5-7 mm. long; petals obcordate, about equaling the sepals; stamens about 
20; pistils many; styles filiform. 
Type collected on the eastern slope of Big Horn Mountains, Wyoming, near the headwaters 
of Clear Creek and Crazy Woman River, in 1900, Frank Tweedy 3215 (herb. N. Y. Bot, Gard.). 
DISTRIBUTION : Type locality and vicinity. 
137. Potentilla Hippiana Lehm. Stirp. Pug. 2: 7. 1830. 
Potentilla leucophylia Torr. Ann. Lyc. N. Y.2: 197. 1827. Not P. leucophylia Pall. 1773. 
Potentilla leneophylia Torr.; Kat. Man. ed. 5. 344. 1829. [Probably a misprint for leucophylla.] 
Potentilla dealbata Dougl.; Hook. Fl. Bor. Am. 1: 188, assynonym. 1833 
Potentilla pennsylvanica Hippiana T. & G. Fl. N, Am. 1: 438. 1840. 
Perennial, with a woody root and short caudex; stem erect, 3-5 dm. high, more or less 
silky-canescent or white with appressed hairs, leafy, dichotomously branched above, the 
branches ascending; stipules 1-2 cm. long, ovate-lanceolate, acuminate, subentire; basal 
