266 * Nelson : New Plants from Wyoming 



cent, no tomentum nor silkiness, very obscurely granulo-glandu- 

 lar as are also the leaves : root leaves few to several, dark green 

 above with obscure pubescence, light green below with a close 

 pubescence, erect, on petioles 8—16 cm. long, pinnate with 5—7 

 leaflets : leaflets obovate in outline, dissected, the segments linear 

 and extending nearly to the thickened midrib, the margins ob- 

 scurely revolute thickened ; the terminal leaflet petiolulate ; the 

 paired ones approximate but not crowded, if three pair equidistant : 

 stem leaves similar, only 2-4, with gradually shorter petioles, the 

 uppermost usually sessile ; the stipules ovate-lanceolate, often 

 acuminate : cyme several-flowered, congested, the first two pedi- 

 cels somewhat elongated, the succeeding ones short : hypanthium 

 moderately pubescent : bracts linear, equaling the lanceolate se- 

 pals : petals small, orbicular, scarcely depressed at summit, only 

 about 4 mm. long, a little shorter than the sepals : style glandular 

 at base, terminal, not longer than the mature akene. 



This is related to P. Pennsylvania but that has leaves less dis- 

 sected, more whitened or even tomentose below, stipules some- 

 what laciniate, the stems stouter and the leaves more lax, larger, 

 obovate petals which equal or exceed the sepals. In character of 

 pubescence the proposed species is nearer P. atrovirens but from 

 that it is at once distinguished by its strict habit and congested 

 inflorescence. 



It has been secured but once, no. 601 1, from a wet, grassy flat, 

 near Mammoth Hot Springs, July 20, 1899. 



y Potentilla Monidensis 



Perennial from a deep-set, woody root which is surmounted by 

 a much branched, woody caudex ; the branches of the caudex 

 densely clothed with old, brown leaf-bases : stems numerous, 1— sev- 

 eral from each crown, prostrate-assurgent, rather slender, silky-stri- 

 gose, 1— 2-leaved, 7—14 cm. long : leaves crowded on the crowns, 

 petioled, 4—6 cm. long (including the petiole), silky -strigose above, 

 white with dense, hirsute-silkiness below, pinnate, with 3-7 pairs of 

 approximate leaflets (occasionally odd leaflets interspersed) ; the 

 basal leaflets digitately cleft nearly to the rachis into oblong-linear 

 segments ; the obovate apical ones pinnately cleft to the midrib 

 into similar segments : stem leaves much reduced, mostly cleft into 

 linear segments : hypanthium silky-hirsute, the narrowly lanceo- 

 late bracts a little shorter and narrower than the lanceolate sepals : 

 petals broadly elliptic or oval, somewhat exceeding the sepals, 

 about 6 mm. long and 4 mm. broad : style slender, not glandular, 

 attached above the middle of the akene, about 3 mm. long. 



