186 ROSACEAE 



linear acute segments. 4 lo 7 lines Ion'.'-; cauliiic leaves ninre sliortly petioled, or 

 subsessile, tlieir leaflets usually iiiucli fewer, often entire; eynie open, few-flowered; 

 flowers about t) to 10 lines wide; pedieels slender, areuate and often eloufrated in 

 fruit; petals yellow or yelldwish. obcordate, exceeding the ealyx-lobes; stamens 

 about 20 ; aehenes 25 to 40. 



Mountain valleys, 4300 to 5700 feet: Siskiyou Co.; Sierra Nevada from Nevada 

 Co. to j\Iodoe Co. June-July. 



Locs. — Siskiyou Co. : Mayten, Alexander ^- KcUofif/ 110 ; Edgewood, Curran. Sierra Nevada : 

 Dassonville, Novada Co., Sonne ; Prattville, Plumas Co., T. Brandegee. 



Var. klamathensis Jepson comb. n. Herbage grayish, the hairs spreading, — Northeastern 

 Shasta Co. (Fail Kiver Valley, BaJcer ^- Nutting). North to southern Oregon. 



Var. densa Jepson var. n. Stems caespitose-prostrate, lYj to 2 inclies long; segments of 

 leaflets shorter, oblong, acutish or obtuse, 2% to S^L- lines long; bractlets broadly oblong, obtuse, 

 equaling the calyx-lobes. — (Caules caespitosi, prostrati, une. 1^2-2 longi; foliolorum segmenta 

 breviora, oblonga, acuta vel obtusa, lin. 2Va-3M! longa; bracteolao late oblongac, scpalis aequan- 

 tae.) — Montane meadows, GOOO to 7000 feet: Nerval Flat, sw. Lassen Co., Robinson 7 (type). 



Var. algida Jepson var. n. Similar to var. densa; stems elongated (3 to 7 inches long), 

 remotely leafy; flowers 6 to 8 lines wide; bractlets narrow-oblong, somewhat obtuse, Vj to % as 

 long as the calyx-lobes. — (Caules elongati (unc. 3-7 longi), remote f oliosi ; flores lin. 6-8 lati; 

 bracteolae anguste-oblongae, obtusiusculae, sepalis ^/4-^/^ breviores.) — Glacial meadow, 6500 

 feet: North Fork Swift Creek, Salmon Mts., n. Trinity Co., Hall 8698 (type). 



Eefs.— POTENTILLA MILLEFOLIA Rydb. Bull. Torr. Club 23:433, pi. 277, figs. 1-5 (1896), type 

 loc. Sierra Valley, Lemmon 86; Eydb. Mem. Dept. Bot. Columbia Univ. 2:105, pi. 43, figs. 1-5 

 (1898). P. plattensis var. miUe folia Jepson, Man. 488 (1925). Var. klamathensis Jepson. 

 P. Mamathensis Eydb. N. Am. Fl. 22:343 (1908), type loc. Fort Klamath, Ore., Leiberg 660. P. 

 plattensis var. klamathciisis Jepson, Man. 488 (1925). Var. densa Jepson. Var. algida Jepson. 



17. P. breweri Wats. Sierra Cinquefoil. Stems from a stout scaly root- 

 crown, horizontally spreading? or diffuse, 4 to 14 (or 20) inclies long; herbage, 

 especially the leaves, silky-villous, or silvery-tomentose when young; leaves pinnate, 

 the blades % to 3 inclies long, the petioles I/2 to as long; leaflets 7 to 13, crowded or 

 discrete, cuneate, deeply incised, 3 to 6 lines long; stipules ovate to oblong, 3 to 9 

 lines long, 1 to 3 lines wide, entire or cleft; flowers 6 to 8 lines wide; petals yellow, 

 roundish, refuse, or obcordate -with obtuse sinus; stamens 20; styles slender, 1% 

 lines long; aehenes 20 to 25. 



Moist meadows, 700 to 13,000 feet: Siskiyou Co.; Sierra Nevada from Lassen 

 Co. to Tulare Co. June-Sept. 



Locs. — Siskiyou Co.: Log Lake, Butler 1520; Shackelford Canon, Jepson 2815. Sierra 

 Nevada: Mt. Shasta, H. E. Broion 472; Bridge Creek, Lassen Co., Balcer ^ Nutting; betw. Mt. 

 Tallac and GUmore Lake, Eldorado Co., Ottley 886 ; Soda Springs Canon, Kennedy Lake, Tuol- 

 umne Co., A. L. Grant 546; Mt. Dana, Jepson 3318; Mono Pass, Jepson 44:67 ; Mt. Lyell, Jepson 

 3335; Vogelsang Pass, Jepson 4429i; Evolution basin, E. Ferguson ; Kearsarge Pass, Jepson 

 863 ; Hockett Mdw., Tulare Co., Culbertson 4458. Alpine plants are sometimes extremely reduced 

 in all parts and densely tomentose: Hornbrook, Siskiyou Co., Hoioell; Whitney Mdws. (mts. 

 above), Tulare Co., Pitrpus 1652. 



Var. expansa Wats. Eobust, erect, 6 to 10 inches high ; leaves larger ; leaflets fewer, approx- 

 imate; herbage green and lightly silky, scarcely tomentose; pedicels elongated. — Upper Tuolumne 

 Eiver basLa: Mt. Lyell, Jepson 3351 ; Tuolumne Mdws., Jepson 4472. 



Var. viridis Jepson. Plants 2 to 5 inches high; herbage mostly green; leaflets sparingly or 

 sometimes densely silky with straight hairs. — Alpine, 8500 to 11,600 feet: Sierra Nevada, easterly 

 summits from Tuolumne Co. to Tulare Co. 



Locs. — Mt. Dana, Jepson 3310; Mt. Lyell, Jepson 3336; Bullfrog Lake, Fresno Co., Jepson 

 846; Junction Mdw., Kern Caiion, Jepson 5027. 



Eefs. — Potentilla breweri Wats. Proc. Am. Acad. 8:555 (1873), type loc. Mono Pass, 

 Brewer 1720; Jepson, Man. 487, fig. 482 (1925), Var. expansa Wats. Bot. Cal, 1:179 (1876), 

 t^'pe loc. Sierra Co., Lemmon; Jepson, Man. 488 (1925). P. plattensis var. leucophylla Greene, 

 Erythea 1:5 (1893), type loc. Independence Lake, Nevada Co., Sonne. Var. viridis Jepson, Man. 

 487 (1925), type loc. Volcano Creek, Mt. Whitney, Tulare Co., Jepson 4950. 



18. P. flabellifolia Hook. Alpine Fan-foil. Stems slender, spreading or 

 ascending, 2^2 to 7 (or 14) inches high; herbage finely pubescent or giabrate; 

 leaves few, mostly basal, on petioles % to 5i/^ inches long; leaflets 3, all sessile or 



