GEXUS 7. 



ROSE FAMILY. 



8. Potentilla monspeliensis L. Rough Cinque- 

 foil. Barren Strawberry. Fig. 2234. 



Potentilla monspeiiensis L, Sp. PL 499. 1753. 

 Potentilla norrcgica L. Sp. PI. 499. 1753. 

 Potentilla hirsiita Michx. Fl. Bor. Am. I : 302. 1803. 

 P. labradorica Lehm. Del. Sem. Hort. Hamb. 1849: 12. 



1849- 



Erect, stout, annual or biennial, branched above, 

 hirsutely rough-pubescent. 6'-2* high. Stipules 

 foliaceou?. incised-dentate or sometimes entire; 

 leaves 3-foliolate. the lower and basal ones petioled, 

 the upper senile or nearly so ; leaflets obovate, green 

 both sides, obtuse at the apex, mostly narrowed at 

 the base, pubescent with spreading hairs. i'-2 r long; 

 flowers yellow, terminal, usually rather densely 

 cymose and leafy-bracted, 3"-6" broad ; calyx-lobes 

 ovate, acute, pubescent, a little longer than the obo- 

 vate retuse petals and somewhat broader than the 

 bractlets ; stamens 15-20: style glandular-thickened 

 below ; achenes glabrous, rugose or smooth. 



In dry soil. Newfoundland and Labrador to South 

 Carolina, Tennessee. Alaska, Kansas. Arizona and Cali- 

 fornia. Also in Mexico. Europe and Asia. Often oc- 

 curs as a weed in cultivated ground ; consists of several 

 races. June-Sept. 



9. Potentilla pentandra Engelm. Five-stamened Cinquefoil. Fig. 2235. 



P. pentandra Engelm.; T. & G. FL X. A. 1 : 447. 18-40. 

 Potentilla riralis 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 leaflets 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, incised-dentate. 

 glabrous or sparingly pubescent above, quite pubes- 

 cent beneath, i'-2 f long; flowers terminal, in a more 

 or less flat-topped cyme, pale yellow, 2 r '-4" broad; 

 calyx-lobes ovate, acute, exceeding the small spatu- 

 late petals, and equalling or slightly shorter than the 

 lanceolate bractlets; stamens 5-8; style thickened 

 below; achenes glabrous. 



In sandy soil. Manitoba to Alberta, Missouri, Ne- 

 braska and Arkansas. June-Sept. 



10. Potentilla argentea L. Silvery or Hoary 

 Cinquefoil. Fig. 2236. 



Potentilla argentea L. Sp. PL 497. 1753. 



Stems ascending, tufted, branched, slightly woody at 

 the base, 4-12' long, white woolly-pubescent. Stipules 

 lanceolate, acuminate; leaves all but the uppermost 

 petioled, digitately 5-foliolate; leaflets oblanceolate or 

 obovate. obtuse at the apex, cuneate at the base, green 

 and glabrous above, white-tomentose beneath, laciniate 

 or incised and with revolute margins, 6"-i2" long^; 

 flowers cymose, terminal, pedicelled, yellow, 2"-+" 

 broad; calyx-lobes ovate, acutish, a little shorter than 

 the obovate retuse petals; stamens about 20; style fili- 

 form ; achenes glabrous. 



In dry soil, Nova Scotia and Ontario to North Dakota, 

 south to Washington. D. C, Indiana and Kansas. Also in 

 Europe and Asia. May-Sept. 



Potentilla collina Wibel, of Europe, collected at Winona, 

 Minn., and Cambridge, Mass., differs in its more prostrate 

 habit, broader and not revolute leaflets, and larger calyx. 



