306 RANUNCULACEAE 



Spur cylindric-filiform for some distance near the apex; fol- 

 licles pubescent. 11. A. elegantula. 

 Sepals and spurs wholly yellow; spur usually slightly curved. 



Leaves thick, densely pubescent beneath; spur slender, abruptly nar- 

 rowed near the base. 12. A. micrantha. 

 Leaves thin, glabrous or glabrate; spur gradually tapering to near the 



apex. 13. A. flavescens. 



Spur 2.5-6 cm. long; flowers in anthesis usually erect. 

 Basal leaves usually twice ternate; spur 3-4 cm. long. 



Sepals blue or white, ovate-lanceolate, acute or obtuse; spur 3-5 cm. 



long. 

 Stem (except the upper part) and petioles glabrous. 



Plant 3-5 dm. high; leaflets thin, rather large, not conspicuously 



glaucous. 14. A. coerulea. 



Plant 1-2 dm. high; leaflets thick, small and conspicuously 



glaucous. 15. A. scopulorum. 



Stem and petioles glandular and villous throughout. 



16. A. pallens. 

 Sepals yellow, lanceolate, somewhat acuminate; spur 2.5-3 cm. long. 



17. A. oreophila. 

 Basal leaves usually thrice ternate: spur 4-7 cm. long; sepals yellow. 



Spur 4-5 cm. long; sepals less than 2 cm. long, ovate-lanceolate, acute; 



follicles strongly curved outward. 18. A. thalictrifolia. 



Spur 5-7 cm. long; sepals 2-4 cm. long, lanceolate to ovate-lanceolate, 



acuminate; follicles almost straight. 19. A. chrysantha. 



1. A. Jonesii Parry. Acaulescent plant, with a densely cespitose short 

 caudex; basal leaves 2-10 cm. long, pubescent, biternate; blades 1-2 cm. in 

 diameter, glaucous; divisions broadly cuneate, deeply 3-5-cleft; scape 2-5 cm., 

 rarely 10 cm. long; flower erect; sepals about 1.5 cm. long; lamina of the petals 

 broad, rounded at the apex, about 8 mm. long; spur 8-10 mm. long, somewhat 

 incurved; follicles 1.5-2 cm. long. Exposed rocky summits: Wyo. Alta. 

 Subalp. -Alp. Je-Jl. 



2. A. Eastwoodiae Rydb. Stem 4-6 dm. high, glandular-puberulent above; 

 leaves biternate; leaflets 1-2 cm. long, with oblong obtuse lobes; flowers white or 

 roseate; sepals lanceolate, acute, spreading; petals nearly like the sepals; follicles 

 about 12 mm. long; styles 6-7 mm. A. ecalcarata East\v . A. mancosana (Eastw.) 

 Cockerell. Canons: Colo. Son. Je-Jl. 



3. A. brevistyla Hook. Stem 4-10 dm. high, pubescent or glandular above; 

 basal leaves biternate; stem-leaves ternate or the upper simple and 3-lobed; 

 leaflets 3-lobed and coarsely crenate; sepals blue, lanceolate, acute, about 15 

 mm. long; lamina of the petals yellowish white; spur 6-8 mm. long; follicles 2-2.5 

 cm. long. Meadows and open woods: Yukon Alta. S.D. Minn. Plain 

 Submont. Je-Jl. 



4. A. saximontana Rydb. Stem 1-2 dm. high; leaves all biternate; leaf- 

 lets obovate, 2-3-cleft; sepals greenish or blue, obtuse or acutish; lamina of the 

 petals yellowish; spur 5 mm. long or less; follicles 1-1.5 cm. long. A. vulgaris 

 brevistyla A. Gray. A. brevistyla Coulter, not Hook. Among rocks: Colo. 

 e Utah. Mont. Subalp. Jl-Au. 



6. A. larimiensis A. Nels. Stem 2-3 dm. high, branched; leaves, except 

 the uppermost biternate; leaflets obovate or cuneate, 1.5-2.5 cm. long, 2-3-cleft 

 and again round-lobed; sepals ovate, acute; lamina of the petals cream-colored; 

 spur 7-8 mm. long; follicles about 1.5 cm. long. Crevices in rocks: Wyo. 

 Mont. Jl-Au. 



6. A. truncata Fisch. & Mey. Stem 3-7 dm. .high, sparingly pubescent or 

 glabrate; lower leaves biternate, the upper ternate; leaflets obovate, 2-6 cm. 

 long, usually pale and pubescent beneath, 3-cleft and round-lobed; sepals scarlet, 

 lanceolate, acute or acuminate; lamina very short, rounded or obsolete, yellow- 

 ish; spur scarlet, narrow, elongate-conic, 1.5-2 cm. long, merely with a knob 

 at the end; follicles pubescent, about 2 cm. long. Shady places along streams: 

 B.C. Calif. s Utah. Submont. Mont. My-Jl. 



7. A. columbiana Rydb. Stem 6-10 dm. high, glabrous or sparingly pubes- 

 cent above; leaves twice ternate; leaflets obovate, 2-3 cm. long, more or less 

 glaucous beneath, 2-3-cleft and deeply crenate at the apex; sepals and spurs 

 very bright red; sepals ovate-lanceolate, acute; lamina yellowish, scarcely 3 mm. 



