434 ROSACEAE 



16. Potentilla Wheeleri S. Wats. Wheeler's Cinquefoil. Fig. 2430. 



Potentilla Wheeleri S. Wats. Proc. Amer. Acad. 11 : 148. 1876. 



Potentilla Wheeleri var. viscidula Rydb. Bull. Torrey Club 23 : 429. 1896. 



Potentilla viscidula Rydb. N. Amer. Fl. 22: 327. 1908. 



Potentilla Wheeleri var. paupercula Jepson, Man. Fl. PI. Calif. 488. 1925. 



Stems many, spreading or decumbent, 5-20 cm. long, branched, silky-villous. Basal leaves 

 numerous, digitately 5-foliolate; leaflets equally silky on both surfaces, cuneate to obovate, 1-2.5 

 cm. long, crenate at the rounded summit; flowers many; sepals ovate, 2-3 mm. long, a little 

 longer than the oblong bractlets, inflexed in fruit. 



Mountain valleys and meadows, Canadian Zone; southern Sierra Nevada, California, to northern Lower 

 California. Type locality: Sierra Nevada, about the headwaters of Kern River. June-Aug. 



17. Potentilla unifldra Ledeb. Single-flowered Cinquefoil. Fig. 2431. 



Potentilla uniflora Ledeb. Mem. Acad. St.-Petersb. 5: 543. 1812. 

 Potentilla macrantha var. uniflora G. Don, Gen. Hist. PI. 2: 550. 1832. 

 Potentilla villosa var. uniflora Ledeb. Fl. Ross. 2:58. 1844. 

 Potentilla nivea var. uniflora Rydb. Bull. Torrey Club 23 : 303. 1896. 



Stems arising from a densely cespitose caudex, about 5 cm. high, slightly villous or tomen- 

 tose, with a few small leaves or nearly scapose, 1-2-flowered. Basal leaves crowded, ternate, 

 silky or glabrate above, densely white-tomentose beneath; leaflets broadly cuneate, 10-15 mm. 

 long, deeply cut from the apex into coarse oblong-lanceolate teeth; hypanthium about 8 mm. 

 broad, villous or tomentose; sepals ovate-lanceolate, acute, 4-5 mm. long; bractlets a little 

 narrower and shorter ; petals 6-8 mm. long ; stamens 20. 



Arctic-Alpine Zone; eastern Asia and in North America from Alaska to Oregon and Colorado. Type 

 locality: Davuria, southeastern Siberia. July-Aug. 



18. Potentilla villosa Pall. Villous Cinquefoil. Fig. 2432. 



Potentilla villosa Pall. ex. Pursh, Fl. Amer. Sept. 353. 1814. 



Potentilla lucida Willd. ex Schlecht. Ges. Nat. Freunde Berlin Mag. 7: 296. 1815. 



Potentilla fragiformis var. villosa Regel & Tiling, Fl. Ajan. 85. 1858. 



Potentilla villosa var. chrysocoma Rydb. Mem. Dept. Bot. Columbia Univ. 2: 88. 1898. 



Stems several from the stout short caudex, 1-3 dm. high, villous with white or yellowish 

 hairs. Basal leaves stout-petioled, ternate, prominently veined and densely white-tomentose be- 

 neath, densely silky above ; leaflets 2-4 cm. long, obovate, coarsely toothed ; cymes few-flowered ; 

 sepals 5-8 mm. long, triangular-ovate, bractlets ovate to oval, about equaling the lobes; petals 

 yellow, 6-12 mm. long; stamens about 20. 



Arctic- Alpine Zone; Alaska to the Olympic Mountains and Mount Rainier, Washington; also eastern 

 Siberia. Type locality: northwest coast. July-Aug. 



19. Potentilla flabellifolia Hook. Mount Rainier Cinquefoil. Fig. 2433. 



Potentilla flabellifolia Hook, ex Torr. & Gray, Fl. N. Amer. 1 : 442. 1840. 

 Potentilla gelida S. Wats. Proc. Amer. Acad. 8: 559. 1873. Not C. A. Mey. 1831. 



Stems from a scaly branching rootstock, slender, 15-30 cm. high, minutely puberulent. 

 Basal leaves usually with long slender petioles, ternate, very thin, short-pubescent or glabrate; 

 leaflets cuneate-flabelliform. deeply incised-serrate ; cymes few-flowered; sepals ovate, acute, 5-6 

 mm. long ; bractlets oval, obtuse, about equaling the lobes ; petals yellow, 8-10 mm. long. 



Arctic- Alpine Zone; British Columbia to the central Sierra Nevada, California. Type locality: Mount 

 Rainier, Washington. June-Sept. 



20. Potentilla saxosa Lemmon. Rock Cinquefoil. Fig. 2434. 



Potentilla saxosa Lemmon ex Greene, Pittonia 1: 171. 1888. 

 Horkelia saxosa Rydb. Mem. Dept. Bot. Columbia Univ. 2:155. 1898. 

 Potentilla rosulata Rydb. Bull. Torrey Club 26 : 542. 1899. 

 Potentilla acuminata Hall, Univ. Calif. Pub. Bot. 1: 86. 1902. 



Stems slender from a branching caudex, 10-30 cm. high, villous-pubescent and glandular. 

 Basal leaves pinnate, villous and glandular; leaflets 5-15, flabelliform, 10-15 mm. long, cleft 

 to the middle into oblong-acutish or rounded segments ; cyme few-flowered ; sepals ovate, acute 

 or short-acuminate, 3 mm. long, a third longer than the ovate or elliptical bractlets; petals 

 yellow, spatulate-oblanceolate, acutish, 2-3 mm. long; stamens 20-40; styles filiform, attached 

 below the apex of the achene. 



Rock crevices, Upper and Lower Sonoran Zone; White Mountains and San Jacinto Mountains, California, 

 to the San Rafael Mountains, Lower California. Type locality: San Rafael Mountains, Lower California. 

 April-June. 



21. Potentilla diversifolia Lehm. Diverse-leaved Cinquefoil. Fig. 2435. 



Potentilla diversifolia Lehm. Stirp. Pug. 2: 9. 1830. 



Potentilla dissecta Nutt. Journ. Acad. Phila. 7: 21. 1834. Not Pursh, 1814. 



Potentilla glaucophylla Lehm. Ind. Sem. Hamb. 1836: 7. 1836. 



Stems slender, erect, 1-3 dm. high, few-leaved, glabrous or strigose. Basal leaves digitate or 

 often pinnate with approximate leaflets, sometimes both kinds on the same plant; leaflets 5-7, 

 cuneate-oblanceolate to obovate, more or less deeply toothed or lobed with triangular-lanceolate 



