Part 4, 1908] ROSACEAE 337 
leaves basal, pinnately 3-foliolate, with the middle leaflet long-petiolulate, sparingly hirsute 
or glabrate, shining; leaflets 1-2 cm. long, very broadly obovate or sometimes nearly 
orbicular in outline, entire at the base, upwards coarsely 5-7-toothed, with the terminal 
tooth generally smaller; flowers on slender pedicels, about 1 cm. in diameter ; hypan- 
thium strigose in fruit, 7-8 mm. in diameter; bractlets ovate or oval, generally obtuse and 
only half as long as the ovate, usually acute sepals, which are about 5 mm. long ; petals 
orbicular or “broadly ovate, slightly retuse, longer than the sepals ; stamens about 20; 
pistils many; styles filiform. 
TYPE LOCALITY : Yosemite Valley. 
DISTRIBUTION : Mountains of California. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: pl. 44, f. 6-10. 
ee Rubricaules Plants more or less cespitose, with ascending or decumbent 
(rarely erect), short, few-leaved or subscapose stems. Jeaves pinnate, with 2 (seldom 3) 
pairs of approximate leaflets, more or less tomentose beneath. Petals yellow, obcordate. 
Styles long and slender, filiform. , 
123. Potentilla tenerrima Rydb. Bull. Torrey Club 23: 398. 1896. 
Tufted from a perennial root; stems many, very slender, generally tinged with red, 
1-1.5 dm. high, sparingly strigose ; stipules linear-lanceolate, acuminate, about 1 cm. long, 
the lower scarious and brown; leaves pinnate with 2 pairs of leaflets and the terminal leaf- 
let sessile, finely silky and a little grayish-tomentulose beneath; leaflets obovate or oblan- 
ceolate in outline, divided to near the midrib into linear acute segments ; flowers on slender 
pedicels, nearly 1 cm. in diameter ; hypanthium silky-strigose, in fruit 5 mm. in diameter; 
bractlets linear, acute, very little shorter than the narrowly lanceolate sepals, which are 
about 4 mm. long; petals obovate, slightly retuse, a little exceeding the sepals; stamens 
about 20; style filiform, nearly terminal; achenes smooth. 
TYPE LOCALITY: Bergen’s Park, Colorado. 
DISTRIBUTION : Mountains of Colorado. 
ILLUSTRATIONS: Bull. Torrey Club 23: f/. 275, f. 1-5; Mem. Dep. Bot. Columbia Univ. 
2: pl. 42, f. 1-5. ‘ 
124. Potentilla rubricaulis Lehm. Stirp. Pug. 2: 11. 1830. 
Perennial, with a short caudex; stems several, ascending, about 2 dm. high, often 
tinged with red, pubescent with spreading hairs; basal leaves pinnate with 5 approxi- 
mate leaflets, rarely trifoliolate; petioles 3-7 cm. long, pubescent with spreading hairs; 
leaflets 1-3 cm. long, obovate or oblanceolate, glabrate above, white-tomentose beneath, 
pinnately cleft into lanceolate acute teeth; stem-leaves mostly ternate; stipules ovate- 
lanceolate, acute, entire; cyme 5-9-flowered; bractlets lance-oblong, acute; sepals ovate- 
lanceolate ; petals obcordate, alittle longer than the sepals; stamens about 20; pistils many; 
styles filiform. 
TYPE LOCALITY: [Not given in the original publication, but supplied in Hooker’s Flora.] 
Near Bear Lake, Mackenzie. 
DISTRIBUTION : Arctic America from the Mackenzie to Ellesmere Land. 
ILLUSTRATION : Lehm. Rev. Potent. p/. 30. 
125. Potentilla rubripes Rydb. Bull. Torrey Club 33: 143. 1906. 
Potentilla rubricaulis Rydb. Mem. Dep. Bot. Columbia Univ. 2: 101. 1898. Not P. rubricaulis 
Lehm. 1830. 
More or less cespitose perennial; stems ascending or prostrate, generally not much 
over 1 dm. long, appressed silky-strigose, more or less leafy and branched ; stipules ovate, 
acute; leaves pinnate, of 2-3 approximate pairs and a sessile terminal leaflet, silky above, 
more or less white-tomentulose beneath; leaflets 5-20 mm. long, obovate or oblong in out- 
line, deeply dissected into narrowly oblong segments; cyme rather few-flowered, with erect 
branches; flowers 12-16 mm. in diameter, on rather slender pedicels; hypanthium silky, 
in fruit 5 mm. broad; bractlets linear-oblong, shorter than the narrowly lanceolate acute 
sepals, which are about 5 mm. long; petals obcordate, 6-8 mm. long; stamens about 20; 
ee ee Not given, but the type was collected on Pike’s Peak, Colorado, June 25, 
1896, Biltmore Colorado Expedition 1 425 (herb. N. Y. Bot. Gard.). 
IBUTION : Alpine regions from Utah and Colorado to Alberta. ; : 
eee : Men. Dep. Bot. Columbia Univ. 2: pl, 40, f. 1-4 (as P. rubricaulis). 
