234 University of California Publications in Botany [Vol. 9 



8. POTENTILLA 



Petals yellow, rarely white. 



Shrubby perennial; style lateral on the densely villous achene 1. P. fruticosa 

 Plants not shrubby above the wood}'' caudex. 

 Style nearly terminal; ovules pendulous. 

 Leaves pinnate. 



Style much longer than the mature achene, filiform. 



Leaflets densely white silky villous, dentate only about the apex; 



petioles short 2. P. Breweri 



Leaflets green on both sides and serrate along the edges; petiole 



long 3. P. dissecta 



Style not longer than the mature achene, thick and glandular below 



4. P. pseudosericea 



Leaves digitate. 



Leaflets more than 3, leaves not trifoliate. 

 Leaflets usually about 7. 



Leaves long-petioled, glabrate above 5. P. etomentosa 



Leaves short-petioled, densely silky on both sides 



6. P. concinnaeformis 



Leaflets usually 5. 



Plants tall (1 foot or more); leaves nearly glabrous above, densely 



white-tomentose below 7. P. gracilis 



Plants low (4-6 inches high); leaves silky on both sides; leaflets 



cuneate and crenate only about the apex 8. P. Wheeleri 



Leaves trifoliate. 



All 3 leaflets sessile or nearly so 9. P. flabellifolia 



Terminal leaflet long stalked 10. P. Grayi 



Style nearly basal; ovules ascending or nearly erect. 



Flowers yellow 11. P. glandulosa 



Flowers white „.. _ 12. P. lactea 



Petals red 13. P. palustris 



1. Potentilla fruticosa L., Sp. PI., p. 495. 1753. 



Dasiphora fi'uticosa (L.) Rydb., Mem. Dept. Bot. Columbia Univ., vol. 2, 

 p. 188. 1898.t 



Type locality. — "Habitat in Eboraco, Anglia, Oelandia australi, 

 Sibiria." 



Range. — Holarctic realm ; in North America south from the arctic 

 regions to New Jersey, Great Lakes, northern Iowa, New Mexico, 

 Arizona, and California. 



Zone. — Canadian to Arctic-alpine. 



8pccime7is examined. — Sierra County, Lemmon 735 ; near summit 

 of Tinker's Knob, Tahoe, Kemiedy and Doten 275; Desolation Valley, 

 Tahoe, Setchell and Dobie, July 6-21, 1901 ; Tamarack trail, Tahoe, 

 8,200 feet. Smiley 253; Bloody Canon, Mono County, R. A. Gibbs, 

 August, 1898; Ebbett's Pass, 8-9,000 feet, Brewer 2087; Mt. Gibbs, 

 south side in granite, 10,100 feet. Smiley 764; saddle between Mt. 

 Dana and Mt. Gibbs, Chesnut and Drew, July 17, 1889 ; Mt. Lyell, 

 Yosemite, 9,300 feet, Hall and Babcock 3558; Mono Pass, Congdon, 

 August 16, 1895. 



t For detailed synonymy see N. Am. Fl., vol. 22, p. 366. 1908. 



