86 BOTAlsTT. 



at Fort Mohave, (Cooper.) It is of frequent occurrence on stream banks 

 through Nevada and Utah ; 4-6,000 feet altitude ; June-September. (324.) 



Var. Grrowing in damp shade ; stems 2° long, decumbent, weak, divar- 

 icately branched, and with the petioles somewhat viscidly pubescent ; leaflets 

 glabrous, very thin, 2' long ; outer calyx-segments spreading and foliaceous ; 

 seeds white, small, and very smooth. (325.) 



PoTENTiLLA Pennsylvanica, L., Var. STRiGOSA, Pursh. Low ; leaflets 

 mostly tomentose on both surfaces, deeply pectinate-divided ; segments linear, 

 entire, with revolute margins ; stipules laciniate. — Rocky Mountains of Colo- 

 rado. On rocky ridges in the East Humboldt Mountains, Nevada ; 9,000 

 feet altitude ; August. (326.) 



PoTENTiLLA DiVEESiFOLiA, Lehm. More or less silky-pubescent with 

 white hairs; stems ascending; radical leaves 5-7-foliolate, the cauline sub- 

 sessile and usually 3-5-foliolate, either pinnate,, pedate or palmate ; leaflets 

 unequal, cuneiform, incisely toothed or lobed, the lobes silky-villous at the 

 apex ; stipules ovate-lanceolate, entire ; flowers few or several, on long divari- 

 cate or erect pedicels ; petals obcordate, nearly twice the length of the calyx ; 

 styles slender, not fleshy nor thickened at base. — A low alpine or subalpine 

 species, rarely attaining a foot in height, and exceedingly variable in its leaf- 

 section. Several very diverse forms occur in the collection, some of which 

 probably merit the rank of varieties. In the Rocky Mountains from Colorado 

 to latitude 56°. Varieties are found also in the Sierras of California. The 

 typical form was collected in the East Humboldt Mountains, Nevada; 

 9 -10,000 feet altitude ; July, August. (327.) 



Var. GLAtrcoPHYLLA, Lehm. I. c, p. 73., t. 31. Glaucous-green; leaves 

 digitate, nearly glabrous on both sides ; leaflets silky on the margin, with un- 

 equal segments. — ;Eocky Mountains of Wyoming (Nuttall) and Colorado, 

 (219 Parry, 171 Vasey;) collected also by Bourgeau in British America. 

 Found on the East Humboldt Mountains, Nevada, and on the Uintas; 

 9-12,000 feet altitude ; August. (328.) There is also what seems to be a 

 reduced form of this, with the three upper leaflets cuneate, 3-lobed at the 

 apex, the lower entire and scattered along the rachis or wanting; stems 

 1-3-flowered. Uinta Mountains ; 12,000 feet altitude ; August. (329.) 



Var. MULTISECTA. Canescent with a not very dense silky pubescence ; 

 leaves digitate or nearly so, the leaflets digitately or pinnately divided and 



