POTENTILLA. ROSACEA. 177 



tacle large, oblong. In damp places, Puget Sound to Alaska, Labrador 

 and the Atlantic (States. 



P. rivalis Nutt. 1. c. 437. Soft-villous with spreading hairs : diffusely 

 branched from the base, or erect and branched above, 4-18 inches high": 

 radical leaves 5-foliolate, or 3-foliolate and the terminal leaflet 3-parted; 

 the upper ones 3-foliolate; stipules lanceolate to ovate, entire or toothed; 

 leaflets ovate to oblong-cuneate, 6-18 lines long, more or less incised-ser- 

 rate : cymes loose, leafy ; pedicels slender; bractlets and sepals nearly 

 equal, acute, 2-3 lines long; petals small; stamens 10-20; achenes usually 

 smooth. In moist places along streams, Oregon and Washington to the 

 Missouri river. 



P. millegrana Engelm. Lehm. Ind. Sem. Hort. Bot. Hamb. 1849. P. 

 rivalis var millegrana Watson. Pubescent throughout with minute soft 

 appressed hairs : stems 6-18 inches long, spreading, profusely branched 

 with divergent branches: leaves all 3-foliolate; stipules large, often nearly 

 free, lanceolate to obovate, acutely 3-lobed, the lower ones often coarsely 

 serrate ; leaflets cuneate-obovate to oblanceolate, coarsely serrate with 

 blunt teeth, 1-2 inches long: cymes very leafy, repeatedly dichotomous 

 with a slender pedicelled flower in the forks ; lobes of the calyx triangular, 

 acute 2 lines long; the lanceolate bractlets nearly as loug; petals obovate 

 about 1 line long : achenes smooth, nearly white. On sandy bars along 

 streams, Brit. Columbia to California and 111. 



P. lateriflora Rydberg 1. c. 261. Soft pubescent with spreading hairs: 

 stems often several from the root 4-20 inches high, terete, finely and 

 rather densely glandular-pubescent, often tinged with red or purple, 

 simple or sparingly branched with erect branches : leaves all 3-foliolate, 

 the lower on petioles 1-4 inches long; stipules small, ovate or oblong, entire 

 or toothed ; leaflets broadly obovate, coarsely crenate, 1-2 inches long by 

 6-18 lines broad ; flowers small, about 3 lines in diametar, on pedicels 2-7 

 lines long, from the axils of upper leaves, making the branches resemble 

 leafy racemes: calyx glandular -pubescent in fruit, about 3 lines in diameter; 

 bractlets ovate-lanceolate or oblong, acute, a little shorter than the ovate; 

 acute sepals : petals yellow, obovate-cuneate, sometimes slightly emargin- 

 ate, shorter than the sepals; stamens about 10; carpels very numerous; 

 style terminal, thickened and glandular at base: achenes smooth, whitish. 

 In moist places and along streams, Brit. Columbia to California, Montana 

 and Arizona. 



§ 2. Styles filiform, not glandular at base : inflorescence 

 cymose. 



* Style terminal ; carpels glabrous : disk not thickened : stamens 

 20-25: herbaceous perennials. 



-*- Leaves pinnate; carpels usually 10-30: bractlets shorter than the 

 sepals. 



P. Drummondii Lehm. Nov. Stirp. Pug. ii, 9. Stems cespitose, 1-2 

 feet high, finely appressed-pubescent, simple; leaves pinnate with 2-5 

 pairs of leaflets, the lower long-petioled ; stipules lanceolate, entire; leaf- 

 lets obovate to oblong, cuneate at base, 6-18 lines long, incisely 8-10 lobed; 

 flowers somewhat panicled at the summit of the stem, on long slender 

 pedicles; bractlets narrowly lanceolate, 2 lines long, nearly equalling the 

 acuminate-ovate, acute calyx-lobes ; calyx hirsute ; petals oblong-obovate 

 with broad rounded, or almost truncate apex, 6 lines long : aehenes smooth, 

 brown. In mountain meadows at high elevations, Brit. Columbia to Cali- 

 fornia and the Rocky Mountains. 



P. Newfoerryi Gray Proc. ^m. Acad, vi, 532. Ivesia gracilis T.&G. 

 Pac. R. Rep. vi, 72. Canescently villous with spreading hairs : stems 

 slender, from an apparently annual or biennial root, 6-8 inches lung : 



