Potentate. ROSACE J3. \ 79 



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

 the flowers on long pedicels. 



In the Sierra Nevada ; Mono Pass (Bracer) ; Summit, above Cisco, Bolandcr. The variety in 

 Sierra County, J. G. Lemmon. 



4. P. Plattensis, Xutt. Low, decumbent, sparingly appressed silky-viUous or 

 nearly glabrous: stems 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, pinnatifid or parted into 3 to 7 or more 

 linear entire or cleft segments : flower's 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. Levis. 28, t. 6. 



Sierra Valley, abundant in meadows (Lcmnion) ; frequent in the Eoeky Mountains and L'intas, 

 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 2J inches long, deeply serrate or pinnatihd 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. Lot. Mag. t. 2984. P. Blmchkeana, Turcz. ; Lehm. 

 Levis. 107, t. 64. 



Var. flabelliforrnis, Torr. & Gray. Leaflets very deeply pinnatifid. — Fl. i. 440. 

 P. flabelliformis, Lehm. ; Hook. Fl. "i. 192, t. 6G. 



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

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



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

 stout. — P. rigida, Xutt. : Torr. & Gray, Fl. i. 440. P. Xuttattii, Lehm. Revis. 

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



Chiefly eastward of the Sierra Nevada, from Oregon and Nevada to the 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, pinnatifid with narrow segments or coarsoly 

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

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

 the lanceolate calyx-lobes: carpels in to 20 or more. Torr. & Gray, FL i. 146. 

 P. divergifolia, Lehm. Revis. 72, t. 31 ; Watson, Lot. King Exp. 86. 



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

 lander. More frequent 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 ami flowering from near the base, leafy : leaves digi- 

 tate; leaflets ■"> to 5, cuneate, 3 - 5 -toot hod at the rounded summit, half an inch 

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

 calyx .'i lines long; hractlets a little smaller than the lobes, obtusish : petals obcor- 

 date, slightly exceeding the calyx : carpels 20. — Proc. Am. Acad. xi. 1 17. 



In the Sierra Nevada, about the head-waters of Kith River, at 8,'Jnu feet altitude, AVA roefe 



+- +- /.■ aves termite. 



8. P. G-rayi, 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 obtusish, 

 onh 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. 



Yoscmito Valley (Bolander, Oray); hike Tonaya (Brewer); peaks almvc Owen's Lake. Kllogg. 



