342 NORTH AMERICAN FLORA [VoLUME 22 
141. Potentilla viridior Rydberg, sp. nov. 
Cespitose perennial, with a short caudex; stems erect or ascending, glabrous or nearly 
so, 2-3 dm. high; basal leaves pinnate, with 5-7 leaflets; petioles 3-8 cm. long, 
sparingly silky-strigose or nearly glabrous; leaflets 0.5-3 cm. long, obovate, green and 
slightly silky above, paler, silky and sparingly tomentulose beneath, deeply serrate with 
lanceolate acute teeth; lower stem-leaves similar, the upper 3-foliolate; cyme 3-12-flow- 
ered; hypanthium silky, in fruit 6 mm. broad; bractlets narrowly linear-lanceolate, 3-5 
mm. long; sepals lanceolate, 4-6 mm. long; petals obcordate, 6-8 mm. long; stamens 
about 20; pistils rather few; styles filiform. 
é Type collected in the mountains of Estes Park, in 1897, G. Z. Osterhout 12 (herb. N. Y. Bot- 
ard.). 
DISTRIBUTION : Mountains of Colorado, 
142. Potentilla ambigens Greene, Erythea 1: 5. 1893. 
Perennial, with a thick woody tap-root; stem stout, 6-7 dm. high, more or less striate, 
densely silky-villous with long spreading hairs, branched above; stipules large, those of the 
basal leaves ovate-oblong, subentire, 2-4 cm. long, more or less membranous and brownish, 
those of the stem ovate, acuminate, green, and more or less toothed with lanceolate teeth ; 
basal leaves with petioles 10-20 cm. long, irregularly pinnate, silky-villous beneath, especially 
on the rachis and the veins, slightly tomentulose when young, more glabrous above; leaflets 
9-15, obovate-oblong, 3-6 cm. long, coarsely serrate, more or less decurrent on the rachis, 
especially the uppermost, which often are confluent; stem-leaves similar but short-petioled 
and with fewer leaflets; bractlets lanceolate, equaling or sometimes even exceeding the 
sepals, which are lanceolate, acute, 6-7 mm. long; petals about 8 mm. long, obcordate, 
about a fourth longer than the sepals; stamens 25; pistils many; styles filiform. 
TYPE LOCALITY: Bear Creek, above Morrison, Colorado. 
DISTRIBUTION : Mountains from New Mexico to Wyoming. 
ILLUSTRATION: Mem. Dep. Bot. Columbia Univ. 2: pi. 57. 
143. Potentilla Bruceae Rydberg, sp. nov. 
Perennial, with a thick woody cespitose caudex; stems several, ascending, 1.5-2 dm. 
high, finely villous, more or less tinged with red; basal leaves 3-5 cm. long, densely and 
softly villous, pinnate, with 5-7 closely approximate leaflets; petioles 1-2 cm. long, villous; 
leaflets broadly cuneate or flabelliform, 7-15 mm. long, coarsely toothed at the apex with 
4-7 broadly ovate teeth ; stem-leaves nearly all ternate and short-petioled ; stipules ovate, 
7-10 mm. long, acute; cyme open, 3-5-flowered; hypanthium villous, in fruit 7 mm. broad; 
bractlets lanceolate, about 3 mm. long; sepals ovate-lanceolate, acuminate, 5-6 nim. long; 
petals obcordate, 6-7 mm. long; stamens about 20; pistils many; styles filiform. 
‘ ree collected on Warner Mountains, Oregon, in 1898, Mrs. C. C. Bruce 2301 (herb. N. Y. Bot. 
ard, ). 
144. Potentilla Breweri S. Wats. Proc. Am. Acad. 8: 555. 1873. 
Potentilla Breweri expansa S. Wats. Bot. Calif. 1: 179, 1876. 
Potentilla plattensis leucophylla Greene, Erythea 1: 5. 1893. 
Perennial, with a thick root and short caudex; stems several from the caudex, erect- 
ascending to decumbent, 1-2.5 dm. high, tomentose, few-leaved ; stipules ovate, the lower 
membranous, brownish and entire, the upper broad, entire or incised; leaves with short 
petioles, densely white silky-villous ; leaflets crowded and often somewhat verticillate, about 
1 cm. long, cuneate and deeply cut-toothed at the apex, with lanceolate divisions; stem- 
leaves similar, but with fewer leaflets; inflorescence dense in the typical form or in the 
variety open; flowers 1-1.5 cin. in diameter; hypanthium silky-villous; bractlets oblong or 
lanceolate, acute, usually.much shorter than the triangular-ovate, acute or acuminate sepals ; 
petals obcordate, 5-10 mm. long, exceeding the calyx; stamens 20; pistils many ; styles 
filiform. 
TYPE LOCALITY: Mono Pass in the Sierra [California]. 
DISTRIBUTION : Mountains of California and adjacent Nevada. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: p/. 52 (var. expansa S. Wats.). 
