PotentiUa. ROSACEA. ] 79 



Var. expansa, AVatson. Less densely tomentose above : cymes loosely expanded, 

 the flowers on long pedicels. 



In the Siena Nevada ; Mono Pass (Brewer) ; Summit, above Cisco, Bolander. The variety in 



Sierra County, J. U. Lcmmon. 



4. P. PlattensiS, Xutt. Low, decumbent, sparingly api)ressed silky-villous or 

 nearly glabrous: ateius slender, 3 to 12 inches long: stipules linear-lanceolate to 

 oblong, mostly entire; leaflets 7 to 15 or more, approximate and nearly uniform in 

 size, 3 to 6 lines long, ovate to oblong, pinnatitid or i)arted into 3 to 7 or more 

 linear entire or cleft segments : flowers on slender pedicels in an open cyme : petals 

 2 or 3 lines long, usually a little exceeding the lanceolate calyx-lobes : carpels 25 to 

 40. — Torr. & Gray, Fl. i. 439 ; Lehm. Kevis. 28, t. 6. 



Sierra Valley, abundant in meadows {Lcmmon) ; frequent in the Rocky Moimtains and Uintas, 

 and northward to British America. 



5. P. gracilis, Dougl. Ascending, 1 to 3 feet high, villous and more or less 

 tomentose, sparingly leafy : leaves digitate or rarely pinnate ; leaflets usually 7, 

 sometimes 5, cuneate-oblong, 1 to 2| inches long, deeply serrate or pinnatifld with 

 linear lobes, white-tomentose beneath, green and somewhat villous above : cyme 

 loose, somewhat fastigiate : petals 3 or 4 lines long, a little exceeding the calyx : 



'carpels 40 or more. — Hook. Bot. Mag. t. 2984. P. Blaschkeana, Turcz. ; Lehm. 

 Eevis. 107, t. 64. 



Var. flabelliformis, Torr. Sc Gray. Leaflets very deeply piunatifid. — Fl. i. 440. 

 P.JiabeIlifnnni><, Lehm. ; Hook. Fl. i. 192, t. G6. 



Var. fastigiata, Watson, 1. c. Cyme shorter and more compact, more densely 

 pubescent : often low. — P. fastigiata, iS^utt. ; Torr. & Gray, Fl. i. 440. 



Var. rigida, Watson, 1. c. Villous, but without tomentum ; usually tall and 

 stout. — P. rigida, Nutt. ; Torr. & Gray, Fl. i. 440. P. Nuttallii, Lehm. Eevis. 

 89, t. 33 ; Watson, Bot. King Exp. 88. 



Chiefly eastward of the Sierra Nevada, from Oregon and Nevada to tlic Rocky Mountains. 

 The var. rigida is the most common in California, from the Cuiamaca Mountains through the 

 whole length of the Sierra Nevada. 



6. P. dissecta, Pursh. Low and alpine, silky-villous without tomentum or 

 nearly glabrous : leaves closely pinnate or as often digitate ; leaflets 5 to 7, or rarely 

 3, cuneate-oblong, an inch long or less, pinnatifld with narrow segments or coarsely 

 serrate, the segments tufted with white hairs : flowers few in an open slender cyme : 

 calyx more or less villous with spreading hairs : petals 2 to 4 lines long, exceeding 

 the lanceolate calyx-lobes: carpels 10 to 20 or more. — Torr. & Gray, Fl. i. 44G. 

 P. diversifolia, Lehm. Eevis. 72, t. 31 ; Watson, Bot. King Exp. 86. 



In the Sierra Nevada, at Mono Pass (Brcicer), and on Mt. Dana at 12,500 feet altitude, Bo- 

 lander. More fre([ueiit in the Rocky Mountains ; a very variable species. 



7. P. Wheeleri, Watson. Small and subalpine, decumbent, silky-villous : stems 

 2 or 3 inches long, branched and flowering from near the base, leafy : leaves digi- 

 tate ; leaflets 3 to 5, cuneate, 3-5-toothed at the rounded summit, half an inch 

 long or less ; stipules entire or nearly so : lower flowers opposite to the leaves : 

 calyx 3 lines long ; bractlets a little smaller than the lobes, obtusish : petals obcor- 

 date, slightly exceeding the calyx : carpels 20. — Proc. Am. Acad. xi. 147. 



In the Sierra Nevada, about the head-waters of Kern River, at 8,200 feet altitude, Bothrocl: 

 ■i- +- Leaves ternate. 



8. P. Grayi, Watson. Stems slender, low, 3-6-flowered: pubescence scanty, 

 villous : leaflets obovate or nearly orbicular, half an inch long, the truncate or 

 rounded apex 5 - 7-toothed ; terminal leaflet long-petiolulate : bractlets obtii.«isli, 

 only half as long as the calyx-lobes : petals 2 or 3 lines long, exceeding the calyx : 

 carpels 15 to 20. — Proc. Am. Acad. viii. 560. 



Yosemite Valley {Bolander, Gray) ; Lake Tenaya {Brewer) ; peaks above Owen's Lake, Kellogg. 



