ROSE FAMILY 435 



divisions, loosely villous-pubescent ; sepals lanceolate, acute, 4-5 mm. long, a little exceeding the 

 similar bractlets ; petals well exceeding the sepals. 



Usually in moist rocky situations, Canadian Zone; British Columbia and Saskatchewan to the Sierra 

 Nevada, California, and Colorado. Type locality: summits of Rocky Mountains [British America] according to 

 Hooker's Flora. June-Aug. 



22. Potentilla brevifolia Nutt. Short-leaved Cinquefoil. Fig. 2436. 



Potentilla brevifolia Nutt. ex Torr. & Gray, Fl. N. Amer. 1 : 442. 1840. 



Stems from a short cespitose caudex, very short, usually less than 1 cm. high, glandular- 

 puberulent. Basal leaves numerous, small with 1 or 2 pairs of leaflets, puberulent ; leaflets sub- 

 orbicular, cuneate at base, 5-10 mm. long, cleft and crenate ; stem leaves 1 or 2, much reduced ; 

 hypanthium 4-5 mm. broad, glandular-puberulent ; sepals broadly ovate, 4 mm. long, exceeding 

 the oblong bractlets ; petals slightly exceeding the sepals. 



Moist slopes, Arctic-Alpine Zone; Blue Mountains, Oregon, to Idaho and Wyoming. Type locality: 

 "Goodier River of the Oregon." Probably Goodwin, Idaho. July-Aug. 



23. Potentilla Grayi S. Wats. Gray's Cinquefoil. Fig. 2437. 



Potentilla Grayi S. Wats. Proc. Amer. Acad. 8: 560. 1873. 

 Potentilla Clarkiana Kell. Proc. Calif. Acad. 7 : 94. 1876. 



Stems subscapose from a short caudex, 5-15 cm. high, sparsely strigose or glabrous. Basal 



leaves pinnately 3-foliolate, with the middle leaflets long-petiolulate, glaucous-green, sparingly 



pubescent or glabrate; leaflets 1-2 cm. long, broadly obovate, coarsely 5-8-toothed; flowers on 



slender pedicels ; sepals about 5 mm. long, about twice the length of the bractlets ; petals slightly 



longer than the sepals. 



Mountain meadows, Canadian and Hudsonian Zones; central and southern Sierra Nevada, California. Type 

 locality: Yosemite. June-Aug. 



24. Potentilla Breweri S. Wats. Brewer's Cinquefoil. Fig. 2438. 



Potentilla Breweri S. Wats. Proc. Amer. Acad. 8: 555. 1873. 

 Potentilla Breweri var. expansa S. Wats. Bot. Calif. 1: 179. 1876. 

 Potentilla plattensis var. leucophylla Greene, Erythea 1 : 5. 1893. 

 Potentilla Bruceae Rydb. N. Amer. Fl. 22 : 342. 1908. 

 Potentilla Breweri var. viridia Jepson, Man. Fl. PI. Calif. 488. 1925. 



Stems several from a short caudex, ascending or decumbent, 10-35 cm. high, tomentose. 

 Basal leaves short-petioled, pinnate, densely white-silky-villous ; leaflets 3-6 pairs, crowded, 

 7-15 mm. long, cuneate, deeply cut-toothed with lanceolate divisions ; stem leaves similar but 

 with few leaflets ; inflorescence dense or rather open ; hypanthium silky-villous, sepals acute 

 or acuminate, 4-5 mm. long ; bractlets narrowly lanceolate, shorter than the lobes ; petals ob- 

 cordate, exceeding the sepals. 



Mountain meadows, Canadian Zone; Lane County, Oregon, south to the southern Sierra Nevada, California. 

 Type locality: Mono Pass, California. June-Sept. 



25. Potentilla klamathensis Rydb. Klamath Cinquefoil. Fig. 2439. 



Potentilla kla7nathensis Rydb. N. Amer. Fl. 22 : 343. 1908. 



Potentilla plattensis var. klamathensis Jepson, Man. Fl. PI. Calif. 488. 1925. 



Stems diffuse or ascending from a short caudex, slender, 1-2 dm. high, sparingly and loosely 

 villous with at first ascending but soon spreading hairs. Basal leaves nearly equaling the stems, 

 with 6-10 pairs of leaflets, loosely hairy; leaflets 1-2 cm. long, dissected into linear-acute seg- 

 ments ; pedicels recurved in fruit, 1-2 cm. long ; sepals linear-lanceolate, acute, 6-7 mm. long ; 

 bractlets 5 mm. long in fruit, linear-oblong ; petals slightly exceeding the sepals, obcordate, 



Low moist alkaline flats, Arid Transition Zone; Klamath and Lake Counties, Oregon, and Modoc County, 

 California. Type locality: near Fort Klamath, Oregon. May-July. 



26. Potentilla millefolia Rydb. Many-leaved Cinquefoil. Fig. 2440. 



Potentilla plattensis Greene, Fl. Fran. 1: 64. 1891. Not Nutt. 1840. 



Potentilla millefolia Rydb. Bull. Torrey Club 23 : 433. 1896. 



Potentilla plattensis var. millefolia Jepson, Man. Fl. PI. Calif. 488. 1925. 



Stems numerous, prostrate or spreading from a short caudex, about 1 dm. long, appressed- 



pubescent. Basal leaves about as long as the stems, pinnate, sparingly strigose ; leaflets 6-12 



pairs, divided nearly to the base into linear-subulate divisions ; flowers on slender pedicels, often 



reflexed in fruit ; sepals lanceolate, about 5 mm. long ; bractlets similar but a little smaller ; 



petals obcordate, longer than the sepals. 



Mountain meadows, Canadian Zone; Siskiyou County to Sierra County, California. Type locality: collected 

 by Lemmon (No. 86), probably in Sierra County. June— July. 



27. Potentilla Hickmanii Eastw. Hickman's Cinquefoil. Fig. 2441. 



Potentilla Hickmanii Eastw. Bull. Torrey Club 29 : 77. 1902. 



Stems slender, decumbent from a short woody taproot, 8-15 cm. long, sparingly strigose. 

 Basal leaves pinnate, with usually 6 pairs of leaflets, sparingly strigose; leaflets 6-15 mm. long, 

 digitately cleft to about the middle into 3-6 lanceolate divisions; pedicels slender, reflexed in 



