ROSACEAE. (Vor. Il. 
10. Potentilla Monspeliénsis L. Rough 
Cinquefoil. (Fig. 1922.) 
Potentilla Monspeliensts l. Sp. Pl. 499. —1753- 
Potentilla Norvegica 1,. Sp. Pl. 499. 1753. 
Potentilla hirsuta Michx. Fl. Bor. Am. 1: 302. 1803. 
Erect, stout, annual or biennial, branched above, 
hirsutely rough-pubescent, 6’-214° high. Stipules 
foliaceous, lanceolate, incised-dentate or some- 
times entire; leaves 3-foliolate, the lower and ba- 
sal ones petioled, the upper sessile or nearly so; 
leaflets obovate, green both sides, obtuse at the- 
apex, mostly narrowed at the base, pubescent 
with spreading hairs, 1/-2’ long; flowers yellow, 
terminal, usually rather densely cymose aud leafy- 
bracted, 3/’-6’’ broad; calyx-lobes ovate, acute, 
pubescent, longer than the obovate retuse petals 
and somewhat broader than the bractlets; stamens 
15-20; style glandular-thickened below, terminal; 
achenes glabrous, rugose or smooth. 
In dry soil, Labrador to South Carolina, west to 
Alaska and Kansas, south in the Rocky Mountains to 
Arizona. Also in Mexico, Europe and Asia. Often 
occurs as a weed in cultivated ground. June-Sept. 
11. Potentilla pentandra Engelm. Five-stamened Cinquefoil. 
P. pentandra Engelm.; T. & G. Fl. N. A. 1: 447. 1840. 
Potentilla rivalis var, pentandra S. Wats. Proc. Am. 
Acad. 8:553. 1873. 
Similar to the preceding species, erect, hirsute, 
1°-4° high, simple at the base, much branched 
above. Stipules lanceolate, somewhat foliaceous, 
dentate or entire; basal and lower leaves slender- 
petioled, 3-foliolate, with the lower pair of leaf- 
lets parted nearly to the base, so as to appear 4- or 
5-foliolate; leaflets oblanceolate or oblong, obtuse 
at the apex, narrowed or cuneate at the base, in- 
cised-dentate, glabrous or sparingly pubescent 
above, quite pubescent beneath, 1/-2’ long; flow- 
ers terminal, in a more or less flat-topped cyme, 
pale yellow, 2’’-4’’ broad; calyx-lobes ovate, 
acute, exceeding the small spatulate petals, and 
equalling or slightly shorter than the lanceolate 
bractlets; stamens 5-8; style thickened below, 
terminal; achenes glabrous. 
Prairies, Manitoba to Missouri and Arkansas. 
June-Sept. 
12. Potentilla leucocarpa Rydberg. 
Diffuse Cinquefoil. 
(Fig. 1923.) 
me sa? : Pog ae 
(Fig. 1924.) 
Potentilla millegrana Engelm.; Lehm. Ind. Sem. 
Hamb. 1849: Add. 12. 1849. Not Dougl. 1833. 
Potentilla rivalis var. millegrana S. Wats. Proc. Am. 
Acad. 8: 553. 1873, 
Decumbent or ascending, annual, usually weak 
and diffusely branched, 6’—-3° high, softly villous- 
pubescent, or glabrate. Stipules ovate or ovate-lan- 
ceolate, entire or sparingly dentate; leaves all but 
the uppermost petioled, 3-foliolate; leaflets oblong, 
cuneate, thin, flaccid, more or less pubescent, in- 
cisely serrate, %/—1 14’ long; flowers terminal, leafy, 
loosely cymose, yellow, about 2’’ broad; calyx: lobes 
ovate, acute, about equalling the lanceolate bract- 
lets, exceeding the obovate petals; stamens about 10; 
style slightly thickened below, terminal; achenes 
small, glabrous. 
In damp soil, Missouri to Minnesota, west to Cali- 
fornia and Washington. May-Sept. 
