178 E0SA.CE^3. POTKNTILLA. 



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, 

 vary 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. 



-1- •<- Leaves digitately 6-7-foliolate. 



P. gracilis Dougl. Hook. Bot. Mag. t. 2984. Villous and more or less 

 tomentose: stems erect, 2-3 feet high: stipules ovale or lanceolate, often 

 long acuminate, entire or sub incised : leaflets mostly 5-7,. rarely 3, ciine- 

 ate-oblong, obtuse, incisely serrate orpinnatifid, white-t.jmentose 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 broadlv 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. Appre^ised-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 so; 

 stipules linear-lanceolato, 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 loni?, about half as long as the broad triangular-ovate acute 

 sepals; petals bright yellow, orbicular or broadly obovate, but little ex- 

 ceeding the sepals, i'lains of Eastern Oregon and Washington to the 

 Saskatchawan. 



-t- -I- -1- 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, oblong, acuminate ; leaflets cuneate-obovate, 

 6-15 lines long, sessile, coarsely lucised-serrate : flowers few or solitary, 

 very large: bractlets ovate, obtuse, shorter than the ovate, acute sepals; 

 petals obcordate, 3-6 lines long, exceeding the sepals. On Mount Rainiei- 

 Washington to Alaska. 



P. flabelllfolia Hook. T. & G. Fl. 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 

 iong: stipules ovate, entire; leaflets suborbicular, 2-3 lines long, 2"3-lobe(i 

 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. 



* * Style attached below the middle of the ovary : carpels on short 

 stipes: receptacle densely villous: disk not thickened : more or less 

 woody perennials. 



