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 Submont. 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: Nev. 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 broadly obovate or flabelli- 

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

 achene. Meadows and roadsides: Newf. 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-clivided 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. 

 from Eu. Plain Submont. 



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

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

 lower divisions deeply 2-3 divided; divisions ovate in outline, cleft and toothed; 

 divisions of the upper leaves lanceolate; sepals reflexed; 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 -Calif. Wash. Sub- 

 mont. -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 slightly hairy when young; 

 immersed leaves 5-10 cm. wide, finely dissected into capillary 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. multifidus 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 cuneate, 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. sceleratus 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 slightly 

 reniform, usuaUy truncate at the base, palmately 3-7-lobed, with rounded entire 

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



