300 RANUXCULACEAE 



with linear or oblong divisions; sepals 2-3 mm. long, oblong; petals oblong. 

 Wet places and open woods: Lab. — Fla. — Colo.— B.C. Plain — Submont. 

 Ap-Jl. 



31. R. micranthus Niitt. Stem 1.5-4 dm. high, branched; basal leaf- 

 blades 1-4 cm. wide, the later 3-cleft or 3-divided, with oblanceolate-cuneate 

 to obovate divisions; upper stem-leaves with linear divisions, sessile; flowers and 

 achenes as in the preceding. R. abortivus micraidhiis A. Gray. Rich woods: 

 Que. — Pa. Colo. — Sask. Plain — Mont. Ai>-Je. 



32. R, sceleratus L. Stem glabrous or nearly so, stout, more or less fleshy, 

 l.o-(3 dm. high, freely branching; blades of the basal leaves 3-10 cm. wide, reni- 

 form, 3-cleft or 3-5-parted; segments round-lobed; upper stem-leaves sessile 

 and with linear lobes; sepals 3-4 mm. long, hairy; petals elhptic; head of achenes 

 oblong, with numerous small glabrous achenes; beak minute. R. eremogenes 

 Greene. Shallow water and swamps: N.B. — Fla. — N.M. — ^S.D.; Eurasia. Plain 

 ~-Mont. Ap-Au. 



33. R. Douglasii Howell. Stem 3-7 dm. high, usually slender; blades of 

 basal leaves 2-6 cm. wide, the middle division 3-cleft and toothed, the lateral 

 ones twice 2-cleft; petals elliptic or spatulate, slightly exceeding the sepals; 

 achenes rather few, glabrous. R. tenellus Nutt. R. Nelsonii ienellus A. Gray. 

 R. arcuatus Heller. Wet places among bushes and open woods: Alaska — Mont. 

 — Colo. — Calif. Submont. — Mont. Ap-Jl. 



34. R. Bongardi Greene. Stem stout, 4-8 dm. high; basal leaf -blades 

 3-10 cm. wide, more distinctly cordate at the base, with broader divisions; 

 flowers and fruit as in the preceding, but the achenes usually hirsute when 

 young. R. occidentalis Lyallii A. Gray. R. Lyallii Rydb. R. Greenei Howell. 

 Open rich woods: Alaska — Mont. — Colo. — Ore. Submont. — Mont. Ap-Jl. 



35. R. Earlei Greene. Like the two preceding; stem sparingly hair}^ or 

 glabrous, 3-5 dm. high; leaves resembling those of R. Bongardi; petals elliptic- 

 obovate, nearly twice as long as the sepals; achenes glabrous. Along mountain 

 streams: Colo. Mont. Je. 



36. R. acriformis A. Gray. Stem strict, 3-5 dm. high; leaf -blades 2-6 cm. 

 wide, strigose, bi- or tri-ternately cleft into lanceolate or linear divisions, the 

 uppermost merely ternate and sessile; sepals strigose, elliptic, about 6 mm. long; 

 petals about 8 mm. long, broadly obovate, often retuse. Bogs and wet meadows: 

 Ida. — Mont. — Colo. Submont i^Moni. Je-Au. 



37. R. occidentalis Nutt. Stem usually ascending, hirsute, 2-3 dm. high; 

 basal leaf-blades 2-4 cm. wide, densely pubescent, deeply 3-parted; terminal 

 segment cuneate, 3-lobed and often toothed; lateral ones obliquely ovate, cleft 

 and toothed; upper stem-leaves small and with linear divisions; petals 10-12 

 mm. long, more than twice as long as the sepals. R. Nelsonii A. Gray, in part. 

 Open woods and low ground: Alaska — ^Mont. — Wyo. — Ore. Submont. Ap-Je. 



38. R. montanensis Rydb. Stem stout, 3-5 dm. high, sparingly hirsute; 

 basal leaf-blades 3-6 cm. wide, silky-hirsute, ternately divided, the divisions 

 again parted and cleft into linear or lanceolate segments; upper stem-leaves 

 sessile, with few linear segments; petals 7-10 mm. long. R. MacCallae Davis, 

 a slender, less leafy form. Wet meadows: Alta. — -Mont. — Ida. Submont. — 

 Mont. Je-Au. 



39. R. oreganus (A. Gray) Howell. Annual; stem erect, glabrous or with 

 a few scattered hairs, 2-10 dm. high; leaves ternate, glabrous; divisions broadly 

 ovate, deeply 3-lobed and serrate; petals obovate, 6-8 mm. long, twice as long 

 as the reflexed sepals; heads of fruit oblong or oval. Wet places: Ore. — -Ida. — 

 Wash. Submont. Je-Au. 



40. R. pennsylvanicus L. f . Mostly annual; stem erect, branching, hirsute, 

 3-8 dm. high; leaf-blades 5-15 cm. wide, very hairy, ternate; divisions petioled 

 (especially the terminal one), ternately or pinnately divided, cleft and toothed, 

 with lanceolate teeth; petals oblong, 2-4 mm. long, shorter than the reflexed 

 sepals; beak broad, flat, less than half as long as the achene. Wet places and 

 shallow water: N.S. — Ga. — N.M. — Wash. — B.C. Plain — Submont. Je-Au. 



