252 



ROSACEAE. 



Vol. ir. 



Potentilla paradoxa Xiitt. I'.ushy Cin(|uefoi 



Mg. 2231. 



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

 Potentilla supina Michx. FI. Bor. Am. i: 304. 1803. 

 Not L. 1753. 



Softly pubescent, animal or biennial, dccinnbent, 

 ascending or nearly erect, ratber stout, bushy, \-2 

 high. Stipules ovate-lanceolate, acute, mainly entire; 

 leaves all but the uppermost petioled, pinnately 7-1 1 - 

 f oliolate ; leaflets obovate or oval, obtuse, 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% i"-S" broad ; petals 

 obovate, cuneate, about equalling the ovate calyx- 

 lobes and lanceolate bractlets ; stamens about 20; 

 style thickened below- ; acbenes glabrous, strongly 

 gibbous. 



Shores of the Great Lakes from New York, Ontario 

 and Pennsj'lvania to Minnesota, south in the Mississippi 

 Valley to Missouri, west to Washington. Oregon and 

 New Mexico. .-\lso in Mexico and M.nntchuria. June- 

 Sept. 



6. Potentilla Nicolletii ( S. Wats.) Sheldon. 

 Nicollet's Cinquefoil. Fig. 2232. 



Potentilla supina var. Nicolletii S. Wats. Proc. Am. Acad. 



8: 553. 1873. 

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



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; flowers about 2s" broad; calyx-tube spar- 

 ingly hirsute, short and broad; bractlets and calyx- 

 lobes ovate-oblong, mucronate, 1 4" long, petals obo- 

 vate-cuneate, about as long as the caly.x-lobes ; 

 stamens 10-15; style fusiform; achenes corky- 

 gibbous. 



In sandy soil, North Dakota to Missouri and Kansas. 

 June-Sept. 



7. Potentilla millegrana Engelm. Diffuse Cinquefoil. Fig. 2233. 



Potentilla millegrana Engelm.; Lehm. Ind. Sem. Hamb. 

 1849 ; Add. 12. 1849. 



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

 Acad. 8 : 553. 1873. 



Potentilla leueocarpa Rydb. in Britt. & Brown, 111. Fh 2 : 

 212. 1897. 



Decumbent or ascending, annual, usually weak 

 and diffusely branched, 6'-3 high, softly villous- 

 pubescent, or glabrate. Stipules ovate or ovate- 

 lanceolate, entire or sparingly dentate ; leaves all but 

 the uppermost petioled, 3-foliolate ; leaflets oblong, 

 cuneate, thin, flaccid, more or less pubescent, inciselj' 

 serrate, i'-i*' long; flowers several, terminal, loosely 

 cymose, yellow, about 2" broad ; caly.x-lobes ovate, 

 acute, about equalling the lanceolate bractlets, ex- 

 ceeding the obovate petals; stamens about 10; style 

 slightly thickened below, terminal ; achenes small, 

 glabrous. 



In damp soil. Illinois to Minnesota. Manitoba, New 

 Mexico. California and Washington. May-Sept. 



Potentilla rivalis Nutt.. a western species which may reach our limits in western Nebraska, 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. 



