POTENTILLA. ROSACEA. 177 



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

 and the Atlantic IStates. 



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 S-parted; 

 the upper ones 3-foliblate; 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 Washipgton to the 

 Missouri river. ^ 



iP. mlUegrana Eftgelm. Lehm. Ind. Sem. Hort. Bot. Hamb. 1849. P. 

 rivalis var millegranai WaUon. Pubescent throughout with minute soft 

 appresaed hairs: stemr. 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, 

 a<;ute 2 lines long ; the lanceolate bractlets nearly as lougj petals obovate 

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

 streams, Brit. Columbia, to California and 111. 



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

 stems often several from the root 4^20 inches high, terete , flnely and 

 ra,ther densely glandular-pubescent, often tinged with red or purple, 

 simple or sparingly branched with erect branches : leaves all 3-foliol£tte,' 

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

 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- 

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

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

 In.ijioist 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, 

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



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

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

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

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

 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 : achenes pmooth, 

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

 fornia and the Rocky Mountains. 



P. Newberry! Gray Proc. Am. Acad, vi, 532. Ivesia gracilis T.&G. 

 Pac.It. Sep. vi, 7^. Canesc^ntly villous with spreading hairs: stems 

 slender, from an apparently annual or bieilnial root, 6-8 inches long ; 



