ROSACEAE. 209 



Potentilla monspeliensis L. Annual or biennial, stout, leafy, erect, 30-80 

 cm. high, hairy; leaves 3-foliolate, or the lowest sometimes S-foliolate, green; 

 leaflets obovate to oblanceolate, serrate, 3-10 cm. long; cyme rather dense, 

 leafy; calyx hairy; petals pale yellow, obovate; stamens usually 20; akenes 

 glabrous, rough. 



In open places, not common. 



Potentilla millegrana Engelm. Annual or biennial, pubescent; stems erect 

 or ascending, branched, 20-60 cm. high;,leaves all trifoliolate; leaflets cuneate- 

 oblong, incisely serrate, the middle one lobed, 2-5 cm. long; cyme loose, the 

 bracts leaf-like; sepals acute; petals pale-yellow, half as long as the sepals; 

 stamens mostly 10, 3—4 mm. long; akenes pale. 



Prairies and river banks, rare in our limits. 



Potentilla biennis Greene. Very similar to P. millegrana, usually some- 

 what glandular; leaflets broadly cuneate-obovate; inflorescence somewhat 

 elongate. 



Prairies, not common. 



Potentilla villosa Pall. Perennial from a thick caudex, densely silvery 

 pubescent; stems 10-20 cm. high, 1-2-leaved; leaves 3-foliolate; leaflets 

 cuneate-obovate, coarsely toothed, silky above, tomentose beneath, 2-4 cm. 

 long; cyme f ew-flo wered ; sepals ovate; petals obcordate, 8-12 mm. long; 

 stamens about 20. 



In rocky places in the mountains at about 2000 m. altitude. Washington 

 northward to Alaska. 



Potentilla flabellifolia Hook. Perennial from a short rootstock, green, 

 nearly glabrous; leaves 3-foliolate, thin; leaflets cuneate-obovate, incisely 

 toothed, minutely pubescent, 2-3 cm. long, the median one petiolulate; petals 

 obcordate, 8-10 mm. long, bright yellow, longer than the sepals; stamens 

 about 20. 



Common in the moist mountain meadows; first found on Mount Rainier 

 by Douglas, according to Hooker but this is an error, as Douglas was never 

 on this mountain. 



Potentilla diversifolia Lehm. Perennial, somewhat silky-pubescent; 

 stems ascending, 10-20 cm. high; basal leaves 5-7-foliolate, pinnate or digitate; 

 leaflets cuneate-oblanceolate, incisely toothed, unequal, silky beneath; cyme 

 few-flowered; petals obovate, emarginate, 6-7 mm. long, one half longer than 

 the sepals; stamens about 20. 



In the mountains at about 1500 m. altitude. 



Potentilla glaucophylla Lehm. Very similar to P. diversifolia, but less 

 pubescent and somewhat glaucous; leaves apparently always digitate. 



Mount Rainier, Piper, and widely distributed in the Rocky Mountains. 



Potentilla gracilis Dougl. Perennial; stems erect, 30-60 cm. high, white 

 villous; leaves digitate; leaflets 5-7, oblanceolate, pinnately incised half way 

 to the midrib into acute teeth, dark green above, densely white tomentose 

 beneath, 3-6 cm. long; petiole of basal leaves long, of the cauline short; cyme 

 flat topped, rather loose; petals bright yellow, obcordate, about 1 cm. long, 

 much longer than the lanceolate sepals. 



Prairies, Vancouver Island to southern Oregon. 



Potentilla macropetala Rydb. Perennial, somewhat pubescent; stems 

 ascending or decumbent at base, 20-40 cm. high, sparsely hairy; leaves 

 digitate, the basal mostly 5-foliolate and long-petioled, the upper ternate and 

 subsessile; leaflets cuneate, coarsely toothed, green, appressed pubescent on 

 both sides; cyme few-flowered; sepals lanceolate to ovate-lanceolate; petals 

 broadly obcordate, about 1 cm. long; stamens about 20. 



Tillamook, Oregon, and southward. 



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