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 tcrnately cleft and toothed; petals obovate, 



mm., equalling or somewhat exceeding the sepals. Wet meadows: Out. — • 

 la. — N.M. — Utah — B.C. Plain—Suhmoni, 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 equalhng the sepals. R. repens S. Wats., not L. River 

 banks and along ditches: Nev. — Ariz.— Neb. Plain — SiibmoiU. 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 — Suhmont. 



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 hairj^; divisions broadly rhombic in outhne, twice cleft 

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

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

 the achene. Fields, meadows, and roadsides: Ne'^'f.^X.C. — Mo. — B.C.; nat. 

 from Eu. Plain — Suhmont, 



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 outhne, 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. Suh- 

 mont, — Mont, Ap-Au. 



46. R. orthorhynchus Hook. Stem slender, hu-sute to nearly glabrous; 

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

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

 — Ore. Suhmont. My-Je. 



47. R. delphinifolius Torr. Plant glabrous or shghily 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 shghtly 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. 



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. — Wvo.— Utah — Wash. Suhmont, Jl-Au. 



Ranunculus limosus X sceleratua, with the habit of R- sceleratus and the leaves and 

 pubescence of R. limosus, has been coUected in Idaho. 



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

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

 lobes: netaLs obovate. 3^ mrn. lone; head of fruit globose, 4-5 nun. thick; beak 



