‘POTENTILLA. ROSACEZ. 177 
tacle large, oblong. Indamp 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 Il. 
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 diameter, on pedicels 2-7 
lines long, from the axils of upper leaves, making the branches resemble 
leafy racemes: calyx glandular-pubescent in fruit, about3 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 
cymuose. "3 
* Style terminal; carpels glabrous: disk not thickened: stamens 
20-25: herbaceous perennials. 
+ Leaves pinnate; carpels usually 10-30: bractlets. shorter than the 
~ sepals. 
PP. Drummondii Lehm. Noy. Stirp. Pug. ii, 9. Stems cespitose, 1-2 
feet high, finely appressed-pubescent, simple; leaves pinnate with 2-5 
airs of leaflets, the lower long-petioled; stipules lanceolate, entire; leaf- 
ets obovate to oblong, cuneate at ase, 6-18 lines long, incisely 8—-10-lobed; 
flowers somewhat panicled at the summit of the stem, on long slender 
pedicles; bractlets narrowly ianceolate, 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 smooth, 
brown. In mountain meadows at high elevations, Brit. Columbia to Cali- 
fornia and the Rocky Mountains. : 
P.. Newberryi Gray Proc. Am. 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 inghes lung: 
