ROSE FAMILY 431 



11. Potentilla Blaschkeana Turcz. Blaschke's Cinquefoil. Fig. 2425. 



Potentilla Blaschkeana Turcz. ex Lehra. Hamb. Gart. & Blumenz. 9: 506. 1853. 

 Potentilla ctenophora Rydb. Mem. Dept. Bot. Columbia Univ. 2: 75. 1898. 



Stems stout, erect, 5-8 dm. high, sparingly silky-pubescent Basal leaves digitate, usually 

 with 7 leaflets, the petioles 5-15 cm. long ; leaflets obovate in outline, deeply cleft into linear or 

 oblong divisions ; cyme many-flowered ; sepals long-acuminate, 5-6 mm. long ; petals obcordate, 

 much exceeding the sepals. 



Meadows, Transition and Boreal Zones; British Columbia and Alberta to northern California. Type locality: 

 near Fort Ross, California. June-Aug. 



Potentilla Blaschkeana var. permollis (Rydb.) Wolf, Bibl. Bot. 16: 212. 1908. Leaves and hypanthium 

 densely and softly pubescent, almost velvety. Eastern Washington; originally collected at Endicott, Whitman 

 County, Washington. 



12. Potentilla flabelliformis Lehm. Fan-shaped Cinquefoil. Fig. 2426. 



Potentilla flabelliformis Lehm. Stirp. Pug. 2: 12. 1830. 



Potentilla gracilis var. flabelliformis Nutt. ex Torr. & Gray, Fl. N. Amer. 1 : 440. 1840. 



Stems slender, erect, 4-6 dm. high, silky-strigose, branched above. Basal leaves 7-foliolate, 

 silky-pubescent above, densely white-tomentose beneath ; leaflets 3-5 cm. long, divided nearly to 

 the midrib into narrowly linear lobes, these revolute on the margin ; sepals triangular-lanceolate, 

 acuminate, 4-5 mm. long, slightly exceeded by the petals. 



Meadows, Arid Transition Zone: eastern British Columbia and Saskatchewan to northeastern California and 

 Wyoming. Type locality: plains of the Saskatchewan, according to Hooker's Flora. June-Aug. 



13. Potentilla Nuttallii Lehm. Nuttall's Cinquefoil. Fig. 2427. 



Potentilla recta Nutt. Gen. 1:310. 1818. Not L. 1753. 



Potentilla rigida Nutt. Journ. Acad. Phila. 7: 20. 1834. Not Wall. 1828. 



Potentilla chrysantha Lehm. in Hook. Fl. Bor. Amer. 1 : 193. 1832. Not Trev. 1818. 



Potentilla Nuttallii Lehm. Stirp. Pug. 9: 44. 1851. 



Potentilla gracilis var. rigida S. Wats. Proc. Amer. Acad. 8: 557. 1873. 



Stems stout, erect, 6-8 dm. high, sparingly pubescent. Basal leaves usually 7-foliolate, 

 prominently veined, green, sparingly pubescent, not at all tomentose, usually glandular-atomif- 

 erous ; leaflets oblanceolate, 5-10 cm. long, toothed about half way to the midrib with lanceolate 

 teeth; cyme many- flowered ; hypanthium about 1 cm. broad in fruit, the lobes long-acuminate; 

 petals 6-8 mm. long. 



Mountain meadows and valleys, Arid Transition and Canadian Zones; British Columbia to Dakota, south to 

 Oregon and Colorado. Type locality: Fort Mandan [North Dakota]. June-Aug. 



Rydberg (N. Amer. Fl. 22: 311-312. 1908) has described three segregates of this species (P. angustata, 

 P. grosseserrata, P. rectiformis) but it is doubtful if the characters relied upon are sufficiently stable to warrant 

 specific distinction. 



Potentilla Nuttallii var. glabrata Lehm. Rev. Potent. 89. 1856. Leaves glabrous except on the veins 

 beneath, otherwise closely resembling the typical form. Washington and Oregon to Wyoming. 



14. Potentilla etomentosa Rydb. Sierra Potentilla. Fig. 2428. 



Potentilla etomentosa Rydb. Bull. Torrey Club 24: 8. 1897. 

 Potentilla amadorensis Ryb. N. Amer. Fl. 22 : 312. 1908. 



Stems ascending or decumbent from a thick caudex, 3-5 dm. high, slightly pubescent. Basal 

 leaves usually 5-7-foliolate, sparsely appressed-pubescent above, more or less silky-pubescent 

 beneath but without tomentum; leaflets obovate to broadly oblanceolate, 3-5 cm. long, the teeth 

 broadly lanceolate, sometimes extending half way to the midrib, but usually shorter; petals ob- 

 cordate, slightly exceeding the ovate-lanceolate sepals. 



Moist places, mainly Arid Transition Zone; Sierra Nevada and North Coast Ranges, California, also 

 western Nevada. Type locality: California. June-Aug. 



Potentilla* etomentosa subsp. Hallii (Rydb.) Abrams. (Potentilla Hallii Rydb. Bull. Torrey Club 28: 176. 

 1901.) This has been placed as a variety of P. gracilis by Wolf, but it is undoubtedly much more closely related 

 to P. etomentosa which it closely resembles in habit and shape of leaves and differs only in the amount of 

 pubescence, the under surface of the leaves being densely silky-pubescent with an obscure tomentum_ beneath. 

 Mountain meadows, Arid Transition Zone; southern Sierra Nevada to San Diego County, California. Type 

 locality: Pine Ridge, Fresno County, California. Considerable variation occurs in the pubescence and depth of 

 leaf-serration, characters which have led to the following segregates by Rydberg: P. Parishii, P. lasia, P. Elmeri, 

 P. comosa, P. Hassei. 



15. Potentilla fastigiata Nutt. Densely-flowered Cinquefoil. Fig. 2429. 



Potentilla fastigiata Nutt. ex Torr. & Gray, Fl. N. Amer. 1 : 440. 1840. 

 Potentilla holopetala var. fastigiata Lehm. Stirp. Pug. 9: 46. 1851. 

 Potentilla gracilis var. fastigiata S. Wats. Proc. Amer. Acad. 8:557. 1873. 

 Potentilla subvillosa Rydb. N. Amer. Fl. 22: 316. 1908. 



Stems low, 1-3 dm. high, ascending, more or less densely silky-villous. Basal leaves 5-7- 

 foliolate, densely white, silky-villous on both surfaces and somewhat tomentose beneath ; leaflets 

 obovate, 1-3 cm. long, usually deeply incised; cyme narrow, usually rather dense; hypanthium 

 silky-villous ; sepals triangular-ovate, acute, 5 mm. long, slightly exceeded by the petals. 



Open grassy places, Arid Transition Zone; Sierra Nevada, California, to Montana, Wyoming, and Utah. 

 Type locality: plains of the Rocky Mountains. June— Aug. 



