CROWFOOT FAMILY 301 



41. R. Macounii Britton. Stem 2-6 dm. high, usually very hirsute, at first 

 usually erect, but later decumbent, branched and leafy; leaf-blades 5-15 cm. 

 wide, ternate, hirsute, especially beneath; segments petiolate, especially the 

 terminal one, rhombic-obovate, twice ternately cleft and toothed; petals obovate, 

 5-7 mm., equalling or somewhat exceeding the sepals. Wet meadows: Ont. — 

 la. — N.M. — Utah — B.C. Plain — Subtnont. Je-Au. 



42. R. rivularis Rydb. Stem hirsute, sometimes more than 1 m. long, 

 rooting at the nodes and there producing plantlets; leaves ternate, 5-15 cm. wide; 

 divisions petiolate, ovate, 3-cleft and coarsely toothed; petals rounded-obovate, 

 about 4 mm. long, scarcely equalling the sepals. R. repens S. Wats., not L. River 

 banks and along ditches: Xev. — Ariz. — Neb. Plain — Submont. Au. 



43. R. repens L. Stem strigose or nearly glabrous, at first ascending, then 

 decumbent and creeping; leaf-blades 3-8 cm. wide, ternate or the lower biternate, 

 strigose or glabrate; divisions petiolate or the lateral ones sometimes subsessile, 

 ternately or biternately cleft and toothed; petals broadlj* obovate or flabelli- 

 form, fully twice as long as the sepals; beak about one-foiu-th as long as the 

 achene. Meadows and roadsides: Ne'n'f. — Va.- — -Utah — ^Wash.; adv. or nat. 

 from Eu. Plain — Submont. 



44. R. acris L. Stem erect, strigose or somewhat hirsute, or nearly glabrous, 

 3-9 dm. high; blades of the basal leaves 3-8 cm. wide, palmately 3-5-divided to 

 near the base, more or less hairy; divisions broadly rhombic in outline, twice cleft 

 into lanceolate lobes; petals broadly obovate, 1 cm. long or more, more than 

 twice as long as the sepals; beak slightly curved, about one-fourth as long as 

 the achene. Fields, meadows, and roadsides: Newf. — -N.C. — Mo. — B.C.; nat. 

 fi'om Eu. Plain — Subnwnt. 



45. R. platyphyllus (A. Gray) A. Xels. Stem 3-6 dm. high, stout, striate, 

 more or less hirsute; basal leaves 6-15 cm. wide, biternate or pinnate, with the 

 lower divisions deepty 2-3 divided; divisions ovate in outUne, cleft and toothed; 

 divisions of the upper leaves lanceolate; sepals refle.xed; petals 8-12 mm. long; 

 heads of fruit oblong or .subglobose, 12-18 mm. long and 10-12 mm. thick. R. 

 orthorhynchus platyphyllus A. Gray. Wet places: Utah — CaHf. — Wash. Sub- 

 77wnt. — Mont. Ap-Au. 



46. R. orthorhynchus Hook. Stem slender, hirsute to nearly glabrous; 

 lower leaves pinnate; divisions cleft into oblong or lanceolate to linear lobes; 

 petals elliptic, 8-12 mm. long; head of fruit globose. Wet ground: B.C. — Wyo. 

 — Ore. Submont. My-Je. 



47. R. delphinifolius Torr. Plant glabrous or shghtly hairy when young; 

 immersed leaves 5-10 cm. wide, finely dissected into capillar}^ divisions, short- 

 petioled: floating or emerged leaves 2-5 cm. wide, with longer petioles, repeatedly 

 ternate, with linear lobes; leaves when growing in mud (var. terrestris) with much 

 shorter and broader divisions, the lobes oblong or lance-ovate; petals 5-8 mm. 

 long, obovate; head of fruit globose or slightly oblong. R. multifidiis Pursh. 

 Shallow water or mud: Me. — N.C. — Kans.— Utah — B.C. Plain. Je-Au. 



48. R. Purshii Richards. Leaf-blades 1-3 cm. wide, cordate at the base, 

 palmately divided in 3-7 more or less cuneate and lobed or cleft divisions, or 

 the immersed ones dissected into filiform divisions; petals obovate, 4-5 mm. 

 long; head of fruit globose, 5-6 mm. broad. Water or mud: N.S. — Ont. — Colo. 

 — Ore. — Alaska. Plain — Mont. Je-S. 



49. R limosus Nutt. Leaf-blades 1-3 cm. wide, reniform in outline, pal- 

 mately divided into more or less cimeate, cleft or lobed divisions; petals obovate, 

 4-5 mm. long: head of fruit globose, 4-5 mm. thick. Shallow water and mud: 

 Mont.— Wyo.— Utah— Wash. Submont. Jl-Au. 



Ranunculus limosus X sceleratus, with the habit of R. sceleraius and the leaves and 

 pubescence of R. limosus. has been collected in Idaho. 



50. R. intertextus Greene. Leaf-blades 1-3 cm. wide, rounded or slightl> 

 reniform, usually truncate at the base, pahnately 3-7-lobed, with rounded entire 

 lobes; petals obovate, 3-4 mm. long; head of fruit globose, 4^5 mm. thick; beak 



