ROSE FAMILY 427 



orbicular, except the upper ones, which are somewhat rhombic, all deeply incised 

 and doubly serrate; stem-leaves similar, only the upper ones slightly reduced; 

 flowers 15-20 mm. in diameter; sepals triangular-lanceolate, long-acuminate; 

 petals orbicular, very concave, much exceeding the sepals. Mountains: (Black 

 Hills) S.D. Alta. Utah Colo. Submont. Subalp. My-Au. 



8. D. pumila Rydb. Cespitose; stem about 1.5 dm. high, sparingly viscid- 

 puberulent or glabrate; basal leaves 4-7 cm. long, with 9-11 leaflets; terminal 

 leaflets broadly obovate or flabelliform-cuneate, about 1 cm. long and broad, 

 serrate above the middle; lateral leaflets broader, often broader than long; stem- 

 leaves 1-3, the uppermost often with but 3 leaflets; inflorescence small, corymbi- 

 form; sepals 5 mm. long; petals rounded-obovate or orbicular, 7-8 mm. long, 

 yellow. Mountains: Ore. Utah Calif. Mont. Je-Au. 



9 D. glandulosa (Lindl.) Rydb. Stem strict, 3-6 dm. high; basal leaves 

 pinnate, sometimes interruptedly so; leaflets 7-9, sparingly hairy, obovate, ob- 

 tuse, simply or doubly serrate, with broad teeth, the upper 1-3 cm. long; stem- 

 leaves smaller, short-petioled, 3-7-foliolate; flowers in an open many-flowered 

 cyme, 10-15 mm. in diameter; sepals oblong or ovate-lanceolate; petals obovate, 

 about equalling the sepals. Mountains: (Black Hills) S.D. B.C. Calif. 

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



10. D. arizonica Rydb. Stem 3-5 dm. high, sparingly viscid-villous, often 

 tinged with red; basal leaves 1-1.5 dm. long, with about 9 leaflets; upper leaflets 

 broadly obovate, coarsely serrate with ovate teeth, the lateral leaflets almost 

 orbicular; lower stem-leaves similar, the upper 3-foliolate; cyme rather dense, 

 few-flowered; sepals ovate-lanceolate, acuminate, 5 mm. long, in fruit 7 mm. 

 long; petals nearly orbicular, about equalling the sepals. Mountains: Ariz. 

 s Utah. Son. Je-.Jl. 



11. D. incisa (Lindl.) Rydb. Stems 3-5 dm. high; basal leaves about 1 dm. 

 long, with 7-9 leaflets; terminal leaflet rhombic-obovate, about 3 cm. long and 

 2 cm. wide, sparingly pubescent or glabrate above, softly pubescent beneath; 

 lower leaflets more obovate and smaller; upper stem-leaves reduced, 3-foliolate; 

 sepals lanceolate, acuminate, 5-6 mm. long, in fruit 8-9 mm. long; petals rounded- 

 obovate, often pale yellow, about 6 mm. long. Meadows: Wash. Ida. Calif. 

 Submont. Je-Jl. 



12. D. oregana (Nutt.) Rydb. Stem 6-7 dm. high; basal leaves 1.5-2 dm. 

 long, with about 9 leaflets; terminal leaflets rounded-obovate, with cuneate base, 

 3-4 cm. long, 2-3 cm. wide, doubly serrate, the lateral leaflets somewhat smaller 

 and more rounded; upper leaves reduced and with 3 oblanceolate leaflets; sepals 

 ovate, mucronate, 5-6 mm. long. Dry copses and sand bars: Mack.- -B.C. - 

 Ore. Ida. Submont. My-Au. 



13. D. albida Rydb. Stems usually several; basal leaves 1-1.5 dm. long, 

 pinnate, with usually 7 leaflets; terminal leaflets 2-4 cm. long, obovate, usually 

 acutish, sparingly pubescent, usually doubly serrate; lateral leaflets more rounded- 

 obovate; stem-leaves 3-5-foliolate, the upper somewhat smaller; inflorescence 

 open; sepals elliptic-ovate, mucronate, about 4-5 mm. long, usually shorter 

 than the sepals. Copses: B.C. Wash. Submont. Je-Jl. 



14. D. micropetala Rydb. Stem 4-6 dm. high, sparingly viscid-villous; 

 basal leaves pinnate, with 5-7 leaflets; terminal leaflet obovate, with cuneate 

 base, 2-3 cm. long, coarsely serrate: lateral leaflets smaller and more rounded; 

 upper stem-leaves 3-5-foliolate; inflorescence rather dense; sepals ovate, mucro- 

 nate, about 4 mm. long; petals 2-3 mm. long. Canons: Utah Ida. Submont. 

 Je-Jl. 



15. D. rhomboidea Rydb. Stem low and slender, about 2 dm. high, 

 simple, about 3-leaved; basal leaves many, short-petioled; leaflets about 7, 

 smooth or beset with a few scattered hairs, rhombic-ovate, mostly acute, serrate, 

 the largest leaflets 1.5 cm., seldom 2 cm. long; upper stem-leaves 3-foholate and 

 subsessile; flowers few in open cymes, about 1 cm. in diameter; sepals ^ 



long, broadly ovate, slightly mucronate; petals yellow, obovate, a little exceeding 

 the sepals. Mountains: Ore. Wash. w Mont. Submont. 



