399 



POTENTILLA MINUTIFOLIA n. Sp. 



Cespitose, stems about i dm. long, slender, i-2-leaved, spar- 

 ingly silky or nearly glabrous, slightly striate ; stipules ovate- 

 lanceolate, the lower scarious and brown ; basal leaves very small, 

 on slender petioles 3-5 cm. long, silky-hirsute, slightly grayish 

 beneath, pinnate, of two pairs of leaflets, the upper pair and the 

 sessile odd leaflet about yy cm. long ; the lower pair only 2-3 

 mm.; leaflets obovate, incised, with oval rounded segments; flowers 

 1-2, about 15 mm. in diameter; calyx sparingly hirsute, in fruit 

 7-8 mm. in diameter; bractlets oblong, generally obtuse, about 

 half as long as the oblong-lanceolate obtuse or acutish sepals ; 

 petals obcordate, about ^/^ longer than the sepals. (Plate 275, 

 figs. 6-10.) 



This somewhat resembles P. snhjiiga, but differs in the small 

 size of the plant and of the leaves, the three terminal leaflets, and 

 their short and rounded segments. 



Colorado: Wm.. M. Canby (Pikes Peak) 1895. 



POTENTILLA SAXI MONTANA n. Sp. 



Densely cespitose; stems several, i-3-flo\vered, less than 5 

 cm. long, silky pubescent. Basal leaves numerous, pinnate with 

 2-3 often approximate pairs of leaflets, silky pubescent and some- 

 what tomentose beneath, short-petioled ; leaflets deeply dissected 

 into oblong obtuse or acute segments; flowers about i cm. in 

 diameter; calyx densely silky; bractlets oblong, obtuse, shorter 

 than the broadly ovate-triangular sepals ; petals broadly obcor- 

 date, much longer than the sepals; stamens about 20; style 

 nearly terminal, about equalling the smooth achene.* 



It somewhat resembles the preceding, but is still more cespi- 

 tose, has much broader sepals and larger leaves, which have 

 much shorter petioles. The leaves resemble somewhat those of 

 P. piiuiatisccta (Wats.) Aven Nelson {P. oi.'ina Macoun), but are 

 slightly tomentose. The flowers are much larger and the sepals 

 much broader than in that species. It resembles also somewhat 

 P. Sojninerfeltii, but has much more dissected leaves, and the style 

 is different. The following specimens have been examined : 



Colorado: John Wolf, no. 366, 1873 (Wheeler's expedition, 

 type); Hooker & Gray, 177 (Torrey's Peak); Knowlton, no. 19, 

 1896 (Pike's Peak). 



* The plate of this will appear in a subsequent number. 



