ROSE FAMILY 415 



21. P. intermittens Rydb. Stems ascending, about 3 dm. high, sparingly 

 hairy; leaflets cuneate-oblanceolate, most of them sharply cut-toothed, with 

 lanceolate teeth directed forward, sparingly silky above, grayish tomentose 

 beneath; inflorescence few-flowered; bractlets linear, 4 mm. long; sepals lance- 

 olate, acuminate, 5-6 mm. long; petals obcordate, 6-7 mm. long. Perhaps a 

 hybrid between P. glaucophylla and P. filipes. Mountains: Alta. Colo. 

 Nev. Submont. Mont. Je-Au. 



22. P. viridescens Rydb. Stem 5-7 dm. high, sparingly silky with appressed 

 or slightly spreading hairs; leaves silky, but green above, silky and somewhat 

 tomentulose beneath; leaflets oblanceolate or spatula te, deeply toothed or divided 

 nearly halfway to the midrib, with lanceolate often somewhat divergent teeth; 

 hypanthium silky; bractlets lanceolate, a little shorter than the ovate-lanceolate 

 sepals; corolla 10-15 mm. in diameter; petals obcordate, equalling or slightly 

 exceeding the sepals. Valleys: Man. Alta. Wyo. Submont. Mont. My-Au. 



23. P. glomerata A. Nels. Stem stout, 4-8 dm. high, softly pubescent 

 with appressed or slightly spreading hairs; leaflets 4-8 cm. long, oblanceolate or 

 narrowly obovate, cut-toothed, green, but densely appressed-hairy above, more 

 or less tomentose beneath; sepals broadly lanceolate, acuminate, 5-8 mm. long; 

 petals rounded-obcordate, 6-8 mm. long. River bottoms: Wash. Calif. 

 Wyo. -Mont. Submont. Mont. Je-Au. 



24. P. dichroa Rydb. Stems strict, 4-6 dm. high, densely white-strigose; leaf- 

 lets oblanceolate, 3-6 cm. long, green and appressed-silky above, white-tomentose 

 and silky beneath, cut-toothed nearly halfway to the midrib; hypanthium silky; 

 bractlets lanceolate, 3-4 mm. long; sepals ovate, acute, 6 mm. long; petals obcor- 

 date, 7-8 mm. long. Meadows: wMont. Ore. Nev. Utah. Submont. Je-Au. 



25. P. gracilis Dougl. Stem 4-7 dm. high, slender, slightly silky-villous; 

 leaflets 3-6 cm. long, oblanceolate, green and nearly glabrous above, densely 

 and finely white-tomentose beneath, divided about halfway to the midrib; bract- 

 lets lanceolate, a little shorter than the ovate-acuminate sepals; corolla 15-20 mm. 

 in diameter; petals obcordate, deeply emarginate, often over 1 cm. long, much 

 exceeding the sepals. Meadows: B.C. -w Mont. Ore. Submont. Je-S. 



26. P. camporum Rydb. Stem simple, strict, 3-4 dm. high, hirsute with 

 spreading or reflexed hairs; leaflets obovate or broadly oblanceolate, 2-5 cm. 

 long, cut-toothed, densely hirsute-strigose above, white-tomentose and silky 

 beneath; bractlets lanceolate, 3-4 mm. long; sepals ovate-lanceolate, 4-5 mm. 

 long; petals obcordate, 5-6 mm. long. Meadows: (Black Hills) S. D. 'Man. 

 Plain. Je-Jl. 



27. P. filipes Rydb. Stems 3-5 dm. high, slender, silky-hirsute or silky- 

 strigose; leaflets obovate to oblanceolate, obtuse, coarsely crenate, 2-6 cm. long, 

 green and sparingly strigose above, white-tomentose beneath; bractlets linear- 

 lanceolate, a little shorter than the lanceolate acute sepals; petals yellow, broadly 

 obcordate, 6-8 mm. long, exceeding the sepals. P. Hippiana pulcherrima S. 

 Wats. P. gracilis Porter & Coulter, not Dougl. Mountains, valleys: Man. 

 N.M Utah Alta. Submont Mont. Je-Au. 



28. P. subjuga Rydb. Tufted; stems many, 1-3 dm. high, silky-villous, 

 few-leaved; leaflets 1-4 cm. long, oblong or obovate, deeply incised into oblong, 

 rather f obtuse segments, silky and green above, silky and white-tomentose 

 beneath; bractlets oblong, obtuse or acute, about a third shorter than the tri- 

 angular-lanceolate sepals; petals broadly obcordate, exceeding the sepals. Moun- 

 tains: Colo. Mont. 



29. P. Vreelandii Rydb. Stems ascending, 1.5-2 dm. high, glabrous and 

 straw-colored below, sparingly pubescent above; basal leaves 5-foliolate, digitate, 

 or pinnate with closely approximate leaflets; leaflets cuneate or obovate-cuneate, 

 glabrous or ciliate on the margins and veins, more or less glaucous, 1-2 cm. long, 

 crenate with rounded-ovate teeth at the apex; inflorescence 1-4-flowered; bract- 

 lets elliptic or oblong, obtuse, about 3 mm. long; sepals ovate, acute, 4-5 mm. 

 long; petals broadly obcordate, about 7 mm. long. Mountains: Mont. Sub- 

 alp. Au. 



