212 



ROSACEAE. 



[VOL. II. 



io. Potentilla Monspeliensis L. Rough 

 Cinquefoil. (Fig. 1922.) 



Potentilla Monspeliensis L. Sp. PI. 499. 1753. 

 Polentilla Norvegica L. Sp. PI. 499. 1753. " 

 Potentilla hirsuta Michx. Fl. Bor. Am. i: 302. 1803. 



Erect, stout, annual or biennial, branched above, 

 hirsutely rough-pubescent, 6'-2 I / 2 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, I'-a' long; flowers yellow, 

 terminal, usually rather densely cymose and 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, \\t-t t.i 

 Alaska and Kansas, south in tlu- Rocky Mountains t" 

 Arizona. Also in Mexico, Europe and Asia, ofun 

 occurs as a weed in cultivated ground. June-Sept. 



ii. Potentilla pentandra Eugelm. Five-stamened Cinquefoil. (Fig. 1923.) 



P. pentandra Engelm. ; T. & G. Fl. N. A. i : 447. 1840. 

 Potentilla rivalis var. pentandra S. Wats. Proc. Am. 

 Acad. 8: 553. 1873. 



Similar to the preceding species, erect, hirsute, 

 i-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-foliolatc; leaflets oblanceolate or oblong, obtuse 

 at the apex, narrowed or cuneate at the base, in- 

 ciscd-dentate, glabrous or sparingly pubescent 

 above, quite pubescent beneath, i'-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. 1924.) 



Potentilla millegrana Engelm.; I.elim. Ind. Scm. 



Hamb. 1849: Add. 12. 1849. Not Dougl. 1833. 

 Potentilla riralis var. millegrana S. Wats. Proc. Am. 



Acad. 8: 553. 1873. 



Decumbent or ascending, annual, usually weak 

 and diffusely branched, 6'-$ 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, J^'-i^' 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 io; 

 style slightly thickened below, terminal; achenes 

 small, glabrous. 



In damp soil, Missouri to Minnesota, west to Cali- 

 fornia and Washington. May -Sept. 



