86 
at Fort Mohave, (Cooper.) It is of frequent occurrence on stream tanks 
through Nevada and Utah ; 4-6,000 feet altitude ; June-September. (324.) 
Var. Growing in damp shade ; stems 2° long, decumbent, weak, divar- 
icately branched, and with the petioles somewhat viscidlj pubescent ; leaflets 
glabrous, very thin, 2' long; outer calyx-segments spreading and foliaceous; 
seeds white, small, and very smooth. (325.) 
PoTENTiLLA Pennsylvanica, L., Var. STEiGOSA, Pursh. Low; leaflets 
mostly tomentose on both surfaces, deeply pectinate-divided ; segments linear, 
entire, with re volute margins ; stipules laciniate. — Eocky Mountains of Colo- 
rado. On rocky ridges in the East Humboldt Mountains, Nevada; 9,000 
feet altitude ; August. (326.) 
PoTENTiLLA DiVERSiFOiJA, Lchm. 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. GLAUCOPHYLLA, Lehm. /. c, p. 73., t. 31. Glaucous-green; leaves 
digitate, nearly glabrous on both sides ; leaflets silky on the margin, with un- 
equal segments. — Rocky Mountains of Wyoming (Nuttall) and Colorado, 
(219 Parry, 171 Vascy ;) 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 Mouutaius ; 12,000 feet altitude ; August. (329.) 
Var. MCLTiSECTA. Canescent with a not very dense silky pubescence ; 
leaves digitate or nearly so, the leaflets digitately or pinnately divided and 
