214 ROSACEAE. [Von. II. 
16. Potentilla efflsa Dougl. Branched 
Cinquefoil. (Fig. 1928.) 
P. effusa Dougl.; Lehm. Nov. Stirp. Pug. 2:8. 1830. 
Closely related to P. Hlippiana and perhaps a 
mere variety of it. Plant 6’-18’ high, diffusely 
branched above; leaves sometimes interruptedly 
pinnate, tomentose-canescent, but not silky; leaf- 
lets 5-11, oblong, obtuse at the apex, commonly 
cuneate at the base, incised dentate, 2/-134’ long; 
flowers yellow, 3/’-5’’ broad, loosely cymose, yel- 
low; bractlets shorter than the lanceolate acute 
calyx-lobes; petals obovate, emarginate, exceeding 
the calyx-lobes; stamens about 20; style terminal; 
achenes glabrous. 
Prairies, western Minnesota (according to Upham) 
to Montana and Colorado. Summer. 
17. Potentilla Pennsylvanica L, 
Prairie Cinquefoil. (Fig. 1929. ) 
Potentilla Pennsylvanica V. Mant. 76. 1767. 
Stem generally erect, 15’—30’ high, tomentose. 
Stipules ovate, often much divided; leaves pinnately 
5-15-foliolate, grayish tomentose beneath, glabrous 
above; leaflets oblong or oblanceolate, cleft halfway 
to the midrib into oblong lobes, margins scarcely 
revolute; cymes dense, the branches erect; petals 
yellow, obovate, truncate or slightly emarginate, 
about equalling the ovate triangular acute sepals 
and the lanceolate bractlets; stamens 20-25; style 
terminal, thickened below; achenes glabrous. 
On prairies, Hudson Bay to the Canadian Rocky 
Mountains, south to New Mexico. Summer. 
Potentilla Pennsylvanica bipinnatifida (Dougl.) T. & G. Fl. N. A. 1: 438. 1838. 
Potentilla bipinnatifida Dougl.; Hook. Fl. Bor. Am. 1: 188. 1833. 
Stem slenderer, leaflets divided nearly to the midrib into linear lobes, white-tomentose be- 
neath, silky above; margins scarcely revolute. Hudson Bay to the Northwest Territory, Michigan 
and Colorado. Perhaps a distinct species. 
Potentilla Pennsylvanica strigosa Pursh, Fl. Am. Sept. 356. 1814. 
Stem usually lower; pubescent with long villous hairs; leaflets with deep narrow divisions, mar- 
gins revolute. Manitobaand the Northwest Territory to Kansas and New Mexico. Also in Siberia. 
18. Potentilla littoralis Rydberg. 
Coast Cinquefoil. (Fig. 1930. ) 
Potentilla littoralis Rydberg, Bull. Torr. Club, 23: 
264. 1896. 
Perennial, tufted, stems ascending or decum- 
bent, branched above, 6’-2° high, appressed- 
silky or glabrate. Stipules ovate-lanceolate, 
cleft or entire, acute; basal and lower leaves peti- 
oled, pinnately 5-7-foliolate, the leaflets approxi- 
mate or apparently digitate; leaflets oblanceolate 
or obovate, incised-pinnatifid into oblong obtuse 
segments, grayish-pubescent beneath, green and 
glabrate above, %’-2!4’ long; flowers yellow, cy- 
mose, 4’’-5’’ broad; petals obovate, equalling or 
slightly exceeding the ovate acute veined sepals 
and the lanceolate bractlets; stamens 20-25; style 
terminal, thickened below; achenes glabrous. 
Coast of Newfoundland and Labrador to Quebec 
and New Hampshire. June-July. . 
