RANUNCULACEAE. 427 



19. Ranunculus Alleghaniensis Britton. MOUNTAIN CROWFOOT. (I. F. f. 

 1611.) Similar in aspect to K. abortivus and R. micranthus, glabrous; stem 

 widely branched, 3-6 dm. tall. Basal leaves reniform or suborbicular, 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 scelera'us 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 c\lindric, 

 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. 



