RA N UNCUL A CEA E 427 



19. Ranunculus Alleghaniensis Brittoa. Mountain Crowfoot. (I. F. f. 



161 1.) Similar in aspect to R. abort Hvus and R. micranthus, glabrous; stem 

 widely branched, 3-6 dm. tall. Basal leaves reniform or sut>orbicular, 1.5-5 cm - 

 wide, long-petioled, crenate or some of them Lobed, the teeth and lobes subacute; 

 stem leaves sessile or the lower petioled, divided into linear acute segments; 

 flowers about 6 mm. broad; petals glandular; head of fruit 4 mm. in diameter; 

 achenes slightly compressed and margined; styles of about one-half their length. 

 Mountains of Va. and N. Car. to Penn., the Catskills. and eastern Mass. April-May. 



20. Ranunculus sceleratus L. Celery-leaved or Ditch Crowfoot. 

 (I. F. f. 1612.) Stout, 1.5-6 dm. high, freely branching. Basal leaves thick 3-5- 

 lobed, on long and broad petioles, the blade 3-5 cm. broad, reniform or cordate. 

 those of the stem petioled or the upper sessile, deeply lobed or divided; flowers 6-8 

 mm. broad, the petals about equalling the calyx; head of fruit oblong or cylindric, 

 8-12 mm. long; achenes I mm. long, very numerous, merely apiculate. In 

 swamps and wet ditches, N. B. to Fla., Kans. and Minn. Also in Europe and 

 Asia. April-Aug. 



21. Ranunculus recurvatus Poir. Hooked Crowfoot. (I. F. f. 1613.) 

 Erect, 1.5-6 dm. high, usually hirsute, branching. Leaves all petioled, broadly 

 reniform, 5-7 cm. wide, deeply 3-cleft, the divisions broadly cuneate, acute, 

 toothed and lobed; flowers light yellow, the petals not exceeding the reflexed 

 calyx; head of fruit globose, 12 mm. wide; achenes compressed, margined. In 

 woods, N. S. to Manitoba, south to Fla. and Mo. April-June. 



22. Ranunculus acris L. Tall or Meadow Buttercup. (I. F. f. 1614.) 

 Hairy, branched above, 6-9 dm. high. Basal leaves tufted, petioled, 3-7-divided, 

 the divisions sessile and cleft into numerous narrow mainly acute lobes; upper 

 leaves short-petioled and merely 3 -parted; flowers about 2 cm. broad; petals twice 

 or thrice the length of the calyx, obovate; head of fruit globose, 12-14 mm. broad. 

 In fields and meadows, common, especially in the Northern States and Canada. 

 Nat. from Europe. May-Sept. 



23. Ranunculus bulbosus L. Bulbous Buttercup. (I. F. f. 1615.) Erect, 

 hairy, 1.5-4 dm. high. Leaves petioled, 3-divided, the terminal division stalked, 

 the lateral ones sessile or nearly so, all variously lobed and cleft, flowers about 

 2 cm. broad; petals much longer than sepals, obovate, rounded; head of fruit 

 globose, 10-12 mm. broad; achenes compressed, very short-beaked. In fields and 

 along roadsides, in the Eastern States. Nat. from Europe. May -July. 



24. Ranunculus Pennsylvanicus L. f. Bristly Buttercup. (I. F. f. 

 1616.) Erect, branching, pilose-hispid, 3-6 dm. high, leafy. Leaves thin, 3- 

 divided; divisions deeply 3-cleft, the lobes lanceolate, cuneate, acute, incised; 

 flowers 6-8 mm. wide; head of fruit 6 mm. thick, sometimes 12 mm. long; achenes 

 smooth, pointed with a sharp beak one-third their length; receptacle hairy. In 

 wet, open places, N. S. to Ga. and west to the Rocky Mts. and Br. Col. June-Aug. 



25. Ranunculus Macounii Britton. Macoun's Buttercup. (I. F. f. 1617.) 

 Erect or diffuse, hairy, branching, 3-6 dm. high. Leaves 3-divided, the blade 

 5-8 cm. long, the divisions broadly oblong, acute, cuneate. variously cleft and 

 lobed; flowers 10-12 mm. broad; head of fruit oblong, 8 mm. thick; achenes 

 smooth, pointed with a sharp beak about one-fourth their length. Western Ont., 

 Iowa and west to the Pacific Coast, extending south in the Rocky Mts. to Ariz. 

 Summer. 



26. Ranunculus repens L. Creeping Buttercup. (I. F. f. 1618.) Gen- 

 erally hairy, sometimes only slightly so. Leaves petioled, 3-divided, the terminal 

 division, or all three stalked, all ovate, cuneate or truncate, acute, cleft and lobed, 

 often blotched; petals obovate, much exceeding the spreading sepals; head of fruit 

 globose, 8 mm. in diameter; achenes margined, tipped with a stout short slightly 

 bent beak. Fields and roadsides, Newf. to Va. and locally in the interior. Mainly 

 introduced from Europe. May-July. 



27. Ranunculus septentrionalis Poir. Swamp or Marsh Buttercup. (I. 

 F. f. 1619.) Roots fibrous; plant branching. 3-9 dm. high, glabrous, or some- 

 times pubescent, the later branches procumbent and sometimes rooting at the 

 nodes. Leaves large, petioled. 3-divided; divisions mostly cuneate cleft into 

 broad lobes; petals obovate. twice the length of the spreading sepals; head 

 of fruit globose or oval, 8 mm. in diameter; achenes flat, strongly margined. 



