298 RANUNCULACEAE 



obovate; head of fruit ovoid; achenes glabrous; beak about 1 mm. long. Arctic 

 regions and alpine summits: Greenl. Alta. Alaska; Eurasia. Alp. Je-Au. 



10. R. glaberrimus Hook. Stem 1 dm. high or less, glabrous, more or less 

 fleshy; basal and lower cauline leaves petioled, thick, glabrous; blades reniform 

 to rounded-oval, usually more or less 3-lobed at the apex; upper stem-leaves 

 cuneate or oblanceolate, entire or 3 cleft; petals rounded-oval, 8-12 mm. long; 

 heads of achenes globose; achenes glabrous, with an only slightly curved beak. 

 R. ellipticus Greene, a form with thinner, more entire basal leaves. Wet places: 

 Wash. Mont. N.M. Calif. Plain Submont. Mr-My. 



11. R. cardiophyllus Hook. Stem 1.5-3 dm. high, more or less villous; 

 basal leaves petioled, thick, pubescent when young; blades 2-4 cm. wide, reni- 

 form or cordate; stem-leaves divided into linear lobes; heads of achenes usually 

 oblong or ellipsoid. R. affinis validus A. Gray. Wet meadows, bogs, and along 

 streams: Sask. Neb. Colo. -Wash. Alta. Plain -Mont. My-Au. 



12. R. inamoenus Greene. Stem 2-3 dm. high, sparingly silky or in age 

 glabrate; basal leaves petioled; blades 2-5 cm. wide, from orbicular to flabelli- 

 form or obovate in outline, the later leaves sometimes pedately 5-divided, with 

 oblanceolate-cuneate divisions; stem-leaves 3-divided, with cuneate or oblance- 

 olate divisions, or the upper with linear lobes; sepals sparingly pubescent; petals 

 oval; heads of achenes 1 cm. long or less, over 5 mm. thick. R. affinis A. Gray, 

 not Hook. Meadows and along streams: Mont. N.M. -Utah -Ida. Sub- 

 mont. Mont. My-Au. 



13. R. micropetalus (Greene) Rydb. Stem slender, 2-3 dm. high, sparingly 

 hairy or glabrate; leaves similar to those of the preceding, but usually thinner; 

 petals light yellow; heads of achenes in well-developed specimens often 2 cm. 

 long, about 4 mm. thick. R. affinis leiocarpus S. Wats., in part, not Trautv. 

 R. affinis micropetalus Greene. Wet meadows and along streams: Colo. 'Utah 

 Ariz. N.M. Submont . Subalp. 



14. R. afflnis R. Br. Stem slender, 1.5-3 dm. high, sparingly silky or 

 glabrate; basal leaf -blades 2-4 cm. wide, the earliest 3-cleft and coarsely toothed 

 or rarely merely toothed, the rest pedately divided into cuneate to oblong or 

 linear, cleft segments; stem-leaves sessile, with linear divisions; petals oval; head 

 of fruit oblong or ovoid, 5-10 mm. long. (?) R. oreogenes Greene. Bogs and 

 wet meadows: Baffins Bay -Sask. -Colo. -Alaska. Subalp. Mont. My-Au. 



15. R. saxicola Rydb. Stem about 1 dm. long, decumbent or ascending, 

 glabrous; basal leaf -blades 2-4 cm. wide, 3-cleft, the middle lobe narrow, entire 

 or slightly 3-toothed, the lateral ones very oblique, coarsely 3-4-toothed; stem- 

 leaves sessile, pedately 3-7-cleft into linear lobes; sepals obovate, half as long as 

 the broadly obovate petals; achenes usually more or less pubescent. Among 

 rocks in the mountains: Alta. Mont. Wyo. Utah. Mont. Je-Jl. 



16. R. eximius Greene. Stem glabrous or nearly so, 1-2 dm. high, erect; 

 basal leaf -blades 2-4 cm. wide, pedately 3-7-cleft, with lanceolate divisions; stem- 

 leaves sessile, with linear divisions; sepals oval or oblong; petals broadly cuneate- 

 obovate, 10-12 mm. long, often overlapping. Below snowdrifts: Mont. Colo. 

 Mont. Subalp. Jl-S. 



17. R. Suksdorfii A. Gray. Stem about 1 dm. high, glabrous; basal leaf- 

 blades 1.5-3 cm. wide, deeply 3-5-cleft, with cleft acute divisions; petals round- 

 obovate, retuse, 8-12 mm. long. Damp ground in the mountains: Wash. Alta. 

 Mont. Mont. -Subalp. Je-Au. 



18. R. utahensis Rydb. Stems 1-2 dm. high, branched above; basal leaf- 

 blades almost orbicular, rather thick, crenate or round-lobed; stem-leaves sessile, 

 deeply cleft or divided into 4-5 oblong or elliptic, obtuse segments; sepals elliptic 

 to obovate, at last reflexed: petals exceeding the sepals; beak rather short. Wet 

 places in the mountains: Utah. Mont. Jl. 



19. R. alpeophilus A. Nels. Stem 1.5-3 dm. high, branched above; basal 

 leaf-blades 1.5-4 cm. wide, orbicular or flabelliform, the later ones often deeply 

 3-lobed, with a narrow middle lobe; divisions of the sessile upper stem-leaves 



