416 ROSACEAE 



30. P. diversifolia Lehm. Stem erect, few-leaved, smooth or strigose, 1-2 

 dm. (rarely 3 dm.) high; basal leaves digitate, or often pinnate with approximate 

 leaflets, or both in the same plant, more or less silky-strigose, especially beneath; 

 leaflets most commonly 7, oblanceolate, cuneate, or sometimes obovate, more 

 or less toothed; bractlets and sepals lanceolate, acute, 3.5-5 mm. long; petals 

 obcordate or obovate and emarginate, 6-7 mm. long, about one-third longer 

 than the sepals. P. dissecta Nutt., not Pursh. Mountain valleys: Sask. B.C. 

 Calif. Colo. Submont, Alp. Je-Au. 



31. P. glaucophylla Lehm. Stems 1.5-4 dm. high, glabrous below, spar- 

 ingly strigose above; leaflets oblanceolate-cuneate, 1-5 cm. long, coarsely ser- 

 rate, with acute teeth directed forward, strigose when young, soon glabrate, 

 glaucous; cyme 3-12-flowered; bractlets lanceolate, 3-5 mm. long, acute; sepals 

 ovate, acuminate, 5-7 mm. long; petals obcordate, 6-10 mm. long. P. diversi- 

 folia glaucophylla Lehm. P. dissecta glaucophylla S. Wats. Mountain valleys: 

 B.C. Sask. N.M. Utah: Submont. Subalp. Je-Au. 



32. P. perdissecta Rydb. Stems 0.5-2 dm. high, when young slightly 

 silky-strigose, glabrate in age; leaflets 1-3 cm. long, obovate in outline, the two 

 lower much smaller, all deeply cleft into oblong or lanceolate acute divisions, 

 glabrous or nearly so, shining; bractlets oblong, obtuse, much shorter than the 

 ovate-lanceolate acute sepals; petals much longer than the sepals, 5-8 mm. long. 

 High mountains: B.C. Alta. Wyo. Utah. Submont. Mont. Je-Au. 



33. P. multisecta (S. Wats.) Rydb. Stem erect, slender, 1-2 dm. high, 

 more or less silky-strigose; leaves more or less silky, digitate, or pinnate with 

 approximate leaflets; leaflets 3-7, the lower smaller, all dissected into linear or 

 linear-oblong divisions; bractlets and sepals oblong-lanceolate, acute, 3-4 mm. 

 long; petals obcordate, about one-half longer than the sepals. P. diversifolia 

 multisecta S. Wats. P. dissecta muliisecta S. Wats. High mountains: Mont. 

 B.C. Wyo. Nev. Mont. Je-Jl. 



34. P. fastigiata Nutt. Stem low, 1-3 dm. high, ascending, generally quite 

 densely silky, rather simple; leaves silky-villous with rather long hairs on both 

 sides and slightly tomentose beneath; leaflets obovate, 1-3 cm. long, coarsely 

 crenate or somewhat incised; cyme usually rather dense; bractlets linear-lance- 

 olate, shorter than the triangular-ovate acute sepals; corolla 10-15 mm. in di- 

 ameter; petals broadly obcordate, a little exceeding the sepals. Meadows: 

 Mont. Wyo. Nev. Submont. Je-Jl. 



35. P. concinnaeformis Rydb. Stems about 1 dm. high, ascending, 

 slightly silky-strigose, subscapose; basal leaves numerous, densely silvery-silky 

 on both sides and slightly tomentose beneath; leaflets 1-2 cm. long, oblong- 

 cuneate, crenate except at the base; bractlets oblong-lanceolate, about a third 

 shorter than the broadly lanceolate sepals; petals yellow, obcordate, a third 

 longer than the sepals. Mountains: Ariz. s Utah. Subalp. Je-Jl. 



36. P. concinna Richards. Stems many, spreading, more or less tomen- 

 tose; leaves densely white-torn entose beneath, silky and slightly tomentose 

 above when young, digitate (sometimes approximately pinnate); leaflets obovate 

 or cuneate, more or less deeply toothed, 1-3 cm. long; sepals ovate, acute, 4-5 

 mm. long; petals obcordate, a little exceeding the sepals, about 6 mm. long. 

 Dry hills and mountains: Colo. Sask. Alta. Ida. Plain Mont. My-Jl. 



37. P. bicrenata Rydb. Stem erect to spreading, 5-7 cm, high, about 

 equalling the leaves, 1-3-flowered; basal leaves digitately 5-foliolate, silky and 

 greenish above, white-tomentose beneath; leaflets 0.5-3 cm. long, oblong-cuneate; 

 sepals ovate or lance-ovate, about 4 mm. long; petals obovate, truncate or 

 emarginate, 5-6 mm. long. Dry hills: N.M. Wyo. Submont. Je. 



38. P. divisa Rydb. Stems spreading or diffuse, 5-10 cm. long, pubescent 

 with long white hairs; basal leaves 5-foliolate, digitate, or pinnate with approxi- 

 mate leaflets; leaflets 1-2 cm. long, obovate or oblanceolate in outline, deeply 

 cleft, with oblong or lanceolate divisions, pubescent above with long white hairs, 

 densely white-tomentose beneath; sepals ovate, about 4 mm. long; petals broadly 

 cuneate, emarginate, about 5 mm. long. P. nivea dissecta S. Wats. P. concinna 



