188 ROSACEAE 



gested, later corymbose-spreading; flowers 7 to 9 lines wide; petals yellow, obcor- 

 date, or obovate and omarf^inate, about Mj longer than the calyx-lobes; stamens 20; 

 achenes many, somewhat reticuhite. 



i\Iontane, GoOO to SGOO feet : Sierra Nevada from Mariposa Co. to Lassen Co. 

 East to Colorado, north to Canada. June-July. 



Locs. — Tuolumne Soda Sprs., Brewer 1708; Lake Valley, near Lake Tahoe, M. S. Baker; 

 Deer Park, Pl.iccr Co., Ilclcn Geis 37; Eagle Lake (mts. 8.), Baker 4" Nutting. 



Var. glaucophylla Lchm. Herbage glaucous, often silky-strigose when young, becoming 

 glabratc; leaves digitate; leaflets narrowly oljlong-cuneate, the margin usually white-silky. — 

 High montane, 8500 to 11,600 feet: Sierra Nevada from Inyo Co. (Cottonwood Lakes, J. Grin- 

 nell) and Tulare Co. ("Volcano Creek, Jepson 4950a) to Mariposa Co. (Mt. Lyell, Jepson 3350; 

 Mt. Dana, Jepson 3318a) and Mono Co. (Bloody Caiion, Jepson 4437). 



Refs. — POTENTILLA DIVERSIFOLIA Lehm. Stirp. Pug. 2:9 (1830), type loc. (ace. Lehm. Eev. 

 Pot. 72, pi. 31, — 1856), "alpine prairies as well as the higher summits of the Rocky Mts. between 

 latitudes 52 and 56," Drummond. P. dissecta Nutt. Jour. Acad. Phila. 7:21 (1834), type loc. 

 "Kamas Prairie toward the sources of the Columbia," Wyeth; Jepson, Man. 488 (1925) in part; 

 ndt P. dissecta Pursh (1814). P. campestris Nutt.; T. & G. Fl. 1:439 (1840) as synonym. P. 

 diversi folia var. genuina Wolf, Biblio. Bot. 16": 501 (1908). Var. glaucophylla Lehm. Stirp. 

 Pug. 9:44 (1851). P. glaucophylla Lehm. Delect. Sem. Hort. Bot. Hamb. 1836:7 (1836), type 

 loc. "plains of the first chain of the Rocky Mts., called the Black Hills." P. dissecta var. glauco- 

 phylla Wats. Proc. Am. Acad. 8:556 (1873); Rydb. Mem. Dept. Bot. Columbia Univ. 2:61, pi. 

 19, figs. 6-10 (1898). 



21. P. gracilis Dougl. Silver Cinquefoil. Stems erect or nearly so, 1 to 1^ 

 feet high, liirsute-pubescent with upwardly appressed or sub-appressed hairs; 

 leaves digitately 5 to 7-foliolate, the basal long-petioled, tufted, the cauline 1 or 2, 

 often subsessile; leaflets oblanceolate or oblong, deeply pinnatifid-serrate with the 

 teeth pointing upward, % to 2^^ inches long, in the typical form with the upper 

 surface very dark green and thinly hairy and the lower surface finely and densely 

 white-tomentose and also hirsute, especially along the veins; cyme much-branched, 

 loose, many-flowered; flowers 7 to 10 lines wide; petals yellow, obcordate,' exceeding 

 the calyx-lobes; stamens 20 to 29; achenes many, smooth. 



Stream banks, valley flats or moist slopes, 2500 to 4700 feet : northern California 

 from Mendocino Co. and eastern Humboldt Co. to Lassen and Modoc Cos. North 

 to Washington, east to western Montana. June- Aug. 



Locs. — Sherwood Valley, Mendocino Co., Davy 5158 ; Lasscck Peak, Humboldt Co., Goddard 

 668 (good match for the original illustration, Bot. Mag. pi. 2984) ; Hupa Valley, Chandler 1390; 

 Sisson, Siskiyou Co., Jepson 102p; Fort Bidwell, M'odoe Co., Jepson 7911; Alturas, South Fork 

 Pitt River, Taylor cf- Bryant ; Amedee, Lassen Co., Davy. 



Note on variation. — Pubescence is variable in Potentilla gracilis and markedly so in var. hallii 

 Wolf. The stems may be hirsute or villous with upwardly appressed, ascending or spreading 

 hairs. Depth of toothing of the margin varies somewhat; but neither toothing nor pubescence 

 character is associated with other characters in a definite manner. The leaves in the form de- 

 scribed as P. etomentosa Rydb. are mostly greener than in the var. hallii Wolf but usually less 

 hairy. 



Var. hallii Wolf. California Cinquefoil. Leaves greenish or green, villous above and below, 

 usually thinly so. — Moist meadows, 3500 to 9000 feet: North Coast Ranges from Lake Co. to 

 Siskiyou Co.; Sierra Nevada from Modoc Co. to Tulare Co.; Tehachapi Mts.; White Mts.; cis- 

 montane Southern California. June- Aug. 



Locs. — North Coast Ranges: Thistle Sprs., Mt. Sanhedrin, Lake Co., Keller 5884; Soldiers 

 Ridge, se. Trinity Co., Jepson 14,172 ; Salmon River, Siskiyou Co., Alexander ^ Kellogg 247. 

 Sierra Nevada: Mineral, Tehama Co., Jepson 12,338; Colby, Butte Co., E. M. Austin; Prattville, 

 Plumas Co., Jepson 4131 ; Bear Valley, Nevada Co., Jepson 14,] 74 ; Donner Lake, Nevada Co., 

 Heller 6889, 6927; Cascade, Lake Tahoe, Chesnut ^ Drew; Carson Pass, Alpine Co., Jepson 

 8105; Kennedy Mdws., Tuolumne Co., Jepson 6540; Mt. Dana, Tuolumne Co., Bretoer 5036; 

 Hetch-Hetchy, Jepson 3469 ; Yosemite Valley, Jepson 4264a ; Huckleberry Creek, Huntington 

 Lake, Jepson 13,066 ; Quail Mdw., Mono Creek, Fresno Co., Jepson 13,198 ; Lake Florence, South 

 Fork San Joaquin River, Jepson 16,062; Simpson Mdw., Middle Fork Kings River, Henrietta 

 Eliot ; Round Mdw., Giant Forest, Jepson 709 ; Alta Mdws., Tulare Co., Newlon 25 ; Volcano 

 Creek, Tulare Co., Jepson 4939. White Mts.: Poison Creek, Jepson 7369. Tehachapi Mts.: 

 Bisses sta., Dudley 436. S. Cal. mts.: Big Pines, Swartout Valley, San Gabriel Mts., Peirson 



