Voi,. II.] 



ROSE FAMILY. 



213 



Potentilla rivalis Xutt., a western species which may reach our limits, is distinguished from this by 

 its usually pinnately 5-foliolate leaves, viscid pubescence, stricter erect habit, and more numerous 

 stamens. It has been collected at the stockyards of Chicago. 



13. Potentilla paradoxa Nutt. Bushy Cinquefoil. (Fig. 1925.) 



P. paradoxa Nutt. : T. & G. Fl. N. A. i: 437. 1840. 

 Polentilla supina Michx. Fl. Bor. Am. i: 304. 1803. 



Not L. 1753. 



Softly pubescent, annual or biennial, decumbent, 

 ascending or nearly erect, rather stout, bushy, i- 

 3 high. Stipules ovate-lanceolate, acute, mainly 

 entire; leaves all but the uppermost petioled, pin- 

 nately 7-ii-foliolate; leaflets obovate or oval, ob- 

 tuse, 6 // -i2 // long, sparingly pubescent, narrowed 

 or rounded at the base, crenate, the upper ones 

 commonly confluent or decurrent on the rachis; 

 flowers terminal, loosely cymose, leafy-bracted, 

 yellow, $"-*," broad; petals obovate, cuneate, about 

 equalling the ovate calyx-lobes and lanceolate 

 bractlets; stamens about 20; style terminal, thick- 

 ened below; achenes glabrous, strongly gibbous. 



Shores of the Great Lakes from Presque Isle, Penn- 

 sylvania to Minnesota, south in the Mississippi Val- 

 ley to Missouri, west to Oregon and New Mexico. 

 Also in Mexico and Mantchuria. June-Sept. 



14. Potentilla Nicolletii (S. Wats.) Shel- 

 don. Nicollet's Cinquefoil. 

 (Fig. 1926.) 



Potentilla SUpina var. Nicollelii S. Wats. Proc. Am. 



Acad. 8: 553. 1873. 

 Potentilla Nicolletii Sheldon, Bull. Geol. Nat. Hist. 



Sun-. Minn. 9: 16. 1894. 



Similar to P, paradoxa, but more spreading and 

 more branched; lower leaves only pinnate, with 

 several leaflets; upper leaves 3-foliolate; teeth of 

 the leaflets acute; inflorescence elongated, falsely 

 racemose; stamens 10-15. 



North Dakota, Minnesota, Iowa and Missouri. 



15. Potentilla Hippiana Lehm. Woolly 

 Cinquefoil. (Fig. 1927.) 



P. Hippiana Lehm. Nov. Stirp. Pug. 2: 7. 1830. 

 Potentilla leucophylla Torr. Ann. N. Y. Lye. 2: 197. 

 1825. Not Pall. 1773. 



Erect or ascending, perennial, branched above, 

 rather stout, i-2 l / 2 high, densely floccose as 

 well as silky. Stipules lanceolate, acuminate, 

 entire; lower and basal leaves petioled, pin- 

 nately 5-11 -foliolate; leaflets oblanceolate or ob- 

 .long, obtuse, narrowed or cuneate at the base, 

 6 // -i8 // long, incisely dentate, very white be- 

 neath, the lower ones smaller than the upper, 

 and no smaller ones interspersed; flowers ter- 

 minal, yellow, loosely cymose, 3 // -6 // broad; 

 petals obovate, retuse, a little exceeding the 

 lanceolate acute calyx-lobes and slightly nar- 

 rower bractlets; stamens about 20; style fili- 

 form, terminal; achenes glabrous. 



Dry soil, northwestern Minnesota and Assiniboia to British Columbia, south to Nebraska and 

 New Mexico. June-Aug. 



