314 RANUNCULACEAE 



Lower sepals one-half to two-thirds as long as the lateral ones. 



Beak of the hood almost as long as the portion below; inflorescence 



usually simple; follicles erect. 3. A. porreclum. 



Beak of the hood seldom one-half as long as the portion below; inflores- 

 cence branched; follicles ascending-spreading. 4. A. divaricalum. 

 Lower sepals at least three-fourths as long as the lateral ones; leaf-seg- 

 ments rather broad. 5. A. Bakcri. 

 Front-line of the hood almost straight, i. e.. the beak directed downward, or 

 slightly porrect in A. columbianum. 

 Segments of the leaves linear-ianceolate. 6. A. ramosum. 

 Segments of the leaves lanceolate. 



Lateral sepals very oblique; upper margin seml-reniform. 



7. A. columbianum. 

 Lateral sepals moderately oblique; upper margin slightly if at all con- 

 cave. 

 Flowers blue. 8. A. insigne. 



Flowers ochroleucous. 9. A. lutescens. 



Primary divisions of at least the stem-leaves entire; thickened portion of the 

 pedicels glabrous. 10. A. patens. 



Whole plant glabrous. 11. A. glaberrimum. 



1. A, tenue Rydb. Stem very slender, about 3 dm. high; leaves few; blades 

 glabrous, thin, shining, almost pentagonal in outline, 5-7-divided to near the 

 base, divisions rhombic, 3-cleft and often again cleft; inflorescence racemose, 

 2-6-flowered ; hood 15-18 mm. long; lateral sepals rounded-ovate, 10-12 mm. 

 long; lower sepals oblong, obtuse. Damp canons: Black Hills, S.D. Mont. Jl. 



2. A. delphinifolium DC. Stem erect, 3-7 dm. high, finely pubescent or 

 glabrate; leaf -blades pentagonal in outline, glabrous, deeply divided to the base, 

 and again cleft; inflorescence few-flowered; hood 2-2.5 cm. long; beak very short; 

 lateral sepals broadly rounded-obovate, a little longer and about 3 times as 

 broad as the oblong lower ones. Wet places: Alaska — -Alta. — B.C. Subalp. — • 

 Alp. Jl-Au. 



3. A. porrectum Rydb. Stem stout, 6-7 dm. high, leafy; basal leaves 

 glabrous; blades reniform-pentagonal in outline, 6-10 cm. wide, 5-7-divided to 

 near the base, divisions rhombic-oblanceolate, variously cleft above; inflorescence 

 mostly racemose; sepals dark blue, ciliate on the margins; lateral sepals broadly 

 obovate or semi-reniform, very oblique; lower sepals lanceolate or oblong. 

 Moist places: Wyo. — -N.M. — -Ariz. — -Utah. Submont. — Mont. Je-Au. 



4. A. divaricatum Rydb. Stem 6-10 dm. high; leaf -blades about 1 cm. 

 broad, finely pubescent, or in age glabrate, divided into about 5 rhombic-oblance- 

 olate divisions, again cleft into broadly lanceolate or ovate-lanceolate lobes; 

 inflorescence branched; sepals purplish or blue; hood narrow, 18-20 mm. long, 

 with a short porrect beak 6-10 mm. long; lateral sepals obovate and somewhat 

 oblique; lower sepals lanceolate; follicles about 15 mm. long, finely viscid. Creek 

 banks: Ida. — Utah — (Yellowstone Park) Wyo. Suhmoyit. — Mont. Jl-Au. 



5. A, Bakeri Greene. Stem 4-6 dm. high; leaf -blades about 6 cm. broad, 

 glabrous, divided into 5-7 rhombic-cuneate divisions, twice cleft into broadly 

 lanceolate lobes; inflorescence almost spike-like; sepals dark blue, more or less 

 pubescent; hood about 18 mm. long; lateral sepals very obliquely obovate; lower 

 sepals oblong, obtuse; follicles nearly erect. A. atrocyaneum Kydh. Wet places 

 in the mountains: Colo. Mont. — Subalp. Jl. 



6. A. ramosum A. Nels. Stem 3-5 dm. high; leaf-blades 5-8 cm. broad, 

 sparsely short-pubescent, divided into 3-5 oblanceolate divisions, these variously 

 cleft into linear-lanceolate lobes; sepals blue, short-pubescent; hood 12-16 mm. 

 long; lateral sepals obovate, somewhat oblique; lower sepals oblong or spatidate, 

 about three-fourths as long and one-fourth to one-third as broad as the lateral 

 ones; follicles 15-20 cm. long, more or less pubescent, straight. Open grassy 

 ground: S.D. — Wyo. Submont. — Mont. Jl-Au. 



7. A. columbianum Nutt. Stem 6-12 dm. high; leaf -blades 5-15 cm. 

 broad, glabroiis or nearly so, divided into 3-5 rhombic divisions, these cleft and 

 toothed with lanceolate teeth or lobes; sepals blue or purple, more or less pubes- 

 cent; hood 15-20 mm. long; follicles usually more or less pubescent, 15-20 mm. 

 long. A.vestitumGrQQTiQ. Moist meadows : B.C. — Mont. — N.M. — Calif. Sub- 

 mont. — -Subalp. Je-S. 



