310 RANUNCULACEAE 



1. D. Penardii Huth. Stem 2-4 dm. high; lower leaves numerous, with 

 broad, often oblong or lanceolate divisions; upper stem-leaves few and with nar- 

 row lobes; inflorescence short; pedicels strongly curved above, bringing the spur 

 in a nearly erect position; follicles pubescent, fully 2 cm. long, erect, and nearly 

 straight. D. camporum Greene. Dry plains: Tex. Colo. Ariz. Plain Sub- 

 mont. Ap-Jl. 



2. D. yirescens Nutt. Stem 3-15 dm. high; leaves finely dissected, with 

 linear or linear-oblong divisions; racemes long, sometimes 5-6 dm.; spur stout, 

 tinged with blue, usually horizontal; follicles pubescent, cylindric, about 2 cm. 

 long, nearly straight and ascending. D. albescens Rydb. Prairies and river 

 valleys: 111. Man. S.D. Colo. Tex. Mo. Plain.* My-Jl. 



3. D. distichum Geyer. Stem 3-6 dm. high (rarely higher), strict; blades 

 of the lower leaves rather thick and veiny, divided into cuneate divisions and these 

 again cleft into oblong or lanceolate acute lobes; upper leaves with linear divi- 

 sions; inflorescence very narrow and spike-like, viscid; sepals oval, obtuse, slightly 

 villous; upper petals white, tinged with blue, obtuse; spur straight, about 15 mm. 

 long; follicles erect, viscid-pubescent. Meadows: Wash. Mont. Ore. Sub- 

 mont. Jl-Au. 



4. D. megacarpum Nels. & Macbr. Stem 2-5 dm. high, at first cinereous- 

 puberulent, becoming glabrate below; lower leaves long-petioled; blades sub- 

 orbicular in outline, divided into cuneate divisions cleft into linear lobes, puberu- 

 lent, slightly ciliate; stem-leaves few and reduced; inflorescence in simple or few- 

 branched racemes; sepals dark blue, softly hirsute; upper sepals brownish white; 

 follicles 2-2.5 cm. long, erect. Among sage-brush: Ore. Ida. Wash. Sub- 

 mont. Je. 



6. D. simplex Dougl. Stem about 3 dm. high; blades of the lower leaves 

 rather thick and finely pubescent, divided into three cuneate divisions; these with 

 oblong, obtuse lobes; lobes of the upper leaves linear; inflorescence strict, narrow, 

 and spike-like; sepals pubescent, oblong, obtuse; upper petals with bluish base 

 and brownish white apex; follicles pubescent, when mature 6-8 mm. long. D. 

 strictum A. Nels. Meadows: Ore. -Wash. Wyo. Submont. Au. 



6. D. cyanoreios Piper. Stem 3-6 dm. high; leaves usually with much 

 narrower divisions than in the preceding, those of the stem-leaves narrowly 

 linear; sepals brighter blue and the straight spur lighter in color; upper petals 

 yellowish white, only tinged with blue; otherwise as the preceding. D. simplex 

 A. Gray, not Dougl. Damp prairies and wet rocky places: B.C. -Ida. Ore. 

 Submont. Je-Au. 



7. D. diversicolor Rydb. Stem about 4 dm. high, simple, strict; leaf- 

 blades finely pubescent, palmately dissected into linear lobes; inflorescence a 

 narrow raceme; sepals oblong-oval, obtuse, 10-13 mm. long, slightly pubescent; 

 petals all white, with blue veins and yellowish below; follicles densely hairy. 

 Bogs: Mont. Mont. Je. 



8. D. Burkei Greene. Stem leafy on y ly near the base, villous-hirsute above; 

 leaf -blades rather fleshy, divided into linear or oblong-linear, obtusish divisions; 

 racemes long and narrow; sepals pubescent exteriorly; follicles appressed- villous. 

 Arid hills: Ida. Submont. 



9. D. Helleri Rydb. Stem about 3 dm. high, viscid-pubescent throughout, 

 few-leaved; leaf-blades more or less viscid-pubescent, 3-5 cm. broad, the lower 

 dissected into linear obtuse, the upper into narrowly linear acute divisions; sepals 

 more or less pubescent, oval; lower petals with acute crenate lobes: follicles viscid- 

 pubescent, nearly straight, about 2 cm. long. Plains: Ida. Plain. 



10. D. Leonard! Rydb. Stem 2-5 dm. high; leaf-blades 4-5 cm. wide, dis- 

 sected into oblong, obtuse divisions, more or less viscid-pubescent; upper leaves 

 with narrowly linear, acute divisions; sepals oblong, obtuse, or the upper acute; 

 lower petals with short lobes; follicles over 2 cm. long, curved, viscid-pubescent, 

 or in age glabrate. River banks and beaches: Utah. Submont. Ap-My. 



11. D. bicolor Nutt. Stem 2-5 dm. high, few-leaved; leaf-blades 2-4 cm. 

 broad, puberulent or glabrate, thick, dissected into linear or linear-oblong obtuse 



