178 . ROSACE ZX. POTENTILLA. 
leaflets 5-10 pairs, scattered on the slender rachis, 3-5-parted with oblong 
segments, 2-4 lines long: flowers on slender pedicels in=a very diffuse 
panicle; calyx nearly 2 lines long, broadly campanulate; bractlets lanceo- 
late, nearly equalling the lanceolate acuminate calyx-lobes; petals white, 
very broadly obovate, 2 lines long, nearly as broad, exceeding the calyx; 
‘ stamens 15-20; carpels numerous; achenes rugose. On sandy plains, 
Washington, at Wallula, to California. ; 
+ + Leaves digitately 5-7-foliolate. 
P. gracilis Dougl. Hook. Bot. Mag. t. 2984. Villous and more or less 
tomentose: stems erect, 2-3 feet high: stipules ovate or lanceolate, often 
long acuminate, entire or sub incised: leaflets mostly 5-7, rarely 3, cune- 
ate-oblong, obtuse, incisely serrate or pinnatifid, white-tumentose beneath, 
green and subvillous or appressed-silky above, 1-3 inches long: flowers in 
a loose subfastigiate cyme, the pedicles at length elongated and slender; 
bractlets narrow, lanceolate, shorter than the broad acute or lanceolate 
sepals; petals broadly obcordate, 3-4 lines long, exceeding the calyx: 
achenes very numerous, oblong, dark brown. Common on dry praries 
and plains, Brit. Columbia to California and the Rocky Mountains. 
P. flabelliformis Lehm.1. c. 12. Appressed-silky and more or less 
white tomentose: stems rather stout, 2-4 feet high, erect, branched ‘above ; 
leaves 5-9-foliolate, the lower long-petiolate; the upper sessile or nearly 80; 
stipules linear-lanceolate, long-acuminate, mostly 3-toothed, 1-2 inches 
long; leaflets linear-oblong in’ outline, 2-4 inches long, deeply pinnatifid 
with linear-lanceolate segments, white-tomentose beneath, green and more 
or less silky above: flowers in ample flat-topped cymes; bractlets lanceo- 
late, 2-3 lines long, about half as long as the broad triangular-ovate acute 
sepals; petals bright yellow, orbicular or broadly obovate, but little ex- 
ceeding the sepals. Plains of Eastern Oregon and Washington to the - 
Saskatchawan. 
+ + + Low, arctic or alpine species: densely villous or subglabrous: 
leaves ternate: flowers few, in a loose cyme, or solitary: the obcordate 
petals exceeding the calyx: carpels 10-40. 
P. villosa Pall. Pursh Fl. 353. Densely white-tomentose: stems 6-12 
inches high: stipules large, cblong, acuminate; leaflets cuneate-obovate, 
6-15 lines long, sessile, coarsely incised-serrate: flowers few. or solitary; 
very large: bractlets ovate, obtuse, shorter than the ovate, acute sepals; 
etals obcordate, 3-6 lines long, exceeding the sepals. On Mount Rainier 
ashington to Alaska. 
P. flabellifolia Hook. T. & G. FI. i, 442. P. gelida American authors 
not Meyer. Nearly glabrous or with scanty minute villous pubescence: 
stems slender, erect or spreading, 6-10 inches long, 1-3-flowered : stipules 
oval or oblong, mostly entire: leaflets flabelliform, 6-9 lines long, rounded 
at the apex and incisely 7-9-toothed, entire at base, the middle leaflet 
shortly petiolulate: bractlets oblong, obtuse, 3 lines long, equalling the 
triangular, acute, sepals; petals broadly obovate, 4-6 lines long, bright 
yellow carpels numerous. Wet banks and meadows of the highest 
mountains, Oregon to Alaska. . 
P. brevifolia Nutt. T. & G. Fl. i, 442. Minutely glandular-pubescent, 
the calyx very sparingly villous: stems decumbent or ascending, 2-3 inches 
long: stipules ovate, entire; leaflets suborbicular, 2-3 lines long, 2--3-lobed 
and crenately toothed, the middle one petiolulate: bractlets acute shorter 
than the acute sepals: petals obovate, scarcely exceeding the calyx; style 
attached below the apex of the ovary. Alpine peaks of Oregon. 
_* * Styleattached below the middle of the ovary: carpels on short 
Stipes: receptacle densely villous: disk not thickened: more or less 
“woody perennials. 
