()4 R O S A C E iE. 



7. P. Wheeleri, Wats. 1. c. xi. 148 (1876). Decumbent, silky-villous , 



2 —3 in. high, leafy and flowering from the base : leaves palmate ; leaflets 

 3 — 5, cuneiform, 3— 5- toothed at the rounded summit, ^2 in- long ; stipules 

 entire : fl. opposite the leaves : calyx 3 lines long ; bractlets obtusish, 

 smaller than the lobes : .petals obcordate, little exceeding the calyx : 

 achenes 20. —Head-waters of Kern Eiver, at 8,200 ft., Rothrock. 



8. P. (lissecta, Pursh, Fl. i. 355 (1814). Stems 1 ft. high, more or less, 

 ascending from a decumbent base ; pubescence usually almost none ; 

 herbage of a deep rich green ; leaves iisually palmate, or closely pinnate ; 

 leaflets 5 — 7, the lowest much reduced in size, uppermost 1 in. long, 

 all pinnately cleft into narrow segments : fl. few, large and showy, in 

 an open cyme : petals exceeding the lanceolate calyx-lobes : achenes 

 10 —15. — In the higher Sierra ; frequent. July, Aug. 



9. P. Nuttallii, Lehm. Ind. Sem. Hamb. 12 (1852) ; Revis. 89. t. 33 : 

 P. rigida, Nutt. in T. & G. Fl. i. 440 (1840), not of Wallich (1828.) : P. 

 graciiis, var. rigida, Wats. Stout, 1 — 2 ft. high, decumbent at the very 

 base, sparingly hirsute with short appressed hairs, no part tomentose or 

 even canescent, but somewhat glandular : leaves palmate ; leaflets 5 — 7, 

 the lowest pair much smaller than the rest, obovate- or oblong-cuneiform, 

 coarsely pinnate-toothed or cleft : cyme rather contracted : petals broadly 

 obcordate, larger than the ovate-lanceolate calyx-lobes : achenes 40 or 

 more, smooth, slightly margined. — Frequent in the higher Sierra, but 

 more common northeastward in the Rocky Mountain region. 



10. P. gracilis, Dougl. in Hook. Bot. Mag. t. 2984 (1830) : P. Blaschke- 

 ana, Turcz. in Lehm. Revis. 107. t. 64 (1856). Taller than the last, often 



3 ft. high, villous throughout, not glandular, lower face of leaves densely 

 white-tomentose : leaflets 7 or more, often pinnate, more or less deeply 

 pinnatifld or only coarsely serrate-toothed : cyme loose and ample : fl. 

 and fr. as in the last.— Frequent in the higher mountains both west and 

 east in the State. 



11. P. Platteusis, Nutt. in T. & G. Fl. i. 439 (1840). Decumbent or 

 depressed, the slender stems 5—10 in. long ; herbage light green, sparingly 

 silky or glabrous : stipules large ; leaflets 7 — 15, ajjproximate, nearly 

 alike in size, 3€~M in- long, cut into 3—5 linear segments : pedicels 

 slender ; cyme open : petals obcordate, 3 lines long, exceeding the lance- 

 olate calyx-lobes : achenes 25—40, very thick, smooth, marginless.— From 

 Sierra Valley northward and far eastward, in mountain meadows, or on 

 elevated plains. 



12. P. Breweri, Wats. Proc. Am. Acad. viii. 555 (1873). Suberect, 

 rather rigid, 3 —10 in. high, densely white-tomentose : stipules broad ; 

 leaflets 7 — 13, rather crowded, cuneate-obovate deeply incised, };^ — 3^ in. 

 long : fl. as in the last, though smaller : achenes 20 — 25. —An alpine 

 species prevailing from the Donner Lake district of the Sierra southward. 



