4 26 FLORA. 



deeply lobed; flowers solitary, 12-18 mm. broad; head of fruit oblong, 12 m. long; 

 achenes tipped with the subulate style. Lab. and Arctic America; also in northern 

 Europe and Asia. Summer. 



11. Ranunculus pygmaeus Wahl. Pigmy Buttercup. (I. F. f. 1605.) 

 Small, 2-5 cm. high, glabrous or sparsely pubescent. Basal leaves slender- 

 petioled, deeply 3-5 -lobed or divided, the blade 6- 12 mm. wide; those of the stem 

 similar and nearly sessile; the petals slightly exceeding the sepals; head of fruit 

 short-oblong, 4 mm. long; achenes I mm. long, lenticular, tipped with a slender 

 beak. Lab., Arctic Am., and in the Rocky Mts. Also in Europe and Asia. 



12. Ranunculus Sabini R. Br. Sabine's Buttercup. Small, 6-10 cm. 

 high, glabrous, and upper portion hairy. Basal leaves petioled, orbicular-reniform, 

 deeply 5 -cleft, about 15 mm. wide, lobes obovate-cuneate 3 -lobed; stem leaves ses- 

 sile, deeply 3-divided into oblong segments; petals 5-8, about half longer than 

 the orbicular sepals. Melville Island and Lab. Also in the northern Rocky Mts. 



13. Ranunculus pedatifidus J. E. Smith. Northern Buttercup. (I. F. f. 

 1606.) Erect, 1-3 dm. high, branching. Basal leaves petioled, broadly ovate or 

 nearly orbicular, about 2 cm. broad, obtuse, crenate or often lobed, those of the 

 stem deeply lobed, nearly sessile, the lobes narrow, obtuse; the petals slightly ex- 

 ceeding the spreading sepals; head of fruit oblong, 5-10 m. long, 4-5 mm. in 

 diameter; achenes oval, tipped with a short beak, often hairy. Lab. and Quebec 

 to Alaska, south in the Rocky Mts. to Ariz. Also in northern Asia. Summer. 



14. Ranunculus cardiophyllus Hook. Heart-leaved Buttercup. Stout, 

 1-3 dm. high, more or less villous. Basal leaves broadly ovate or orbicular, 

 often subcordate at the base, and upper portion crenate or lobed; stem leaves ses- 

 sile, pedately 3-7 divided into oblong divisions; petals one-half or more longer than 

 the sepals; head of fruit 10-15 mm. long, 6-8 mm. in diameter; achenes oval, 

 tipped with a short curved beak. Lab. to Br. Col., south to Quebec, S. Dak. 

 and Colo. June. 



15. Ranunculus ovalis Raf. Prairie Crowfoot. (I. F. f. 1607.) Pubes- 

 cent, branching, 1.5-4 dm. high. Lower and basal leaves oval, oblong, or ovate - 

 oblong, long-petioled, the blade 2-3 cm. in length or more, crenate or slightly 

 lobed, obtuse, the base more or less cuneate; upper cauline leaves sessile or short 

 petioled, deeply divided into 3-7 linear or oblong obtuse lobes; flowers 18-24 mm. 

 broad; carpels and achenes oval or orbicular, minutely beaked. In fields and on 

 prairies, Lab. and Ont. to the N. W. Terr., 111. and Neb. March-May. 



16. Ranunculus Harveyi (A. Gray) Britton. Harvey's Buttercup. (I. F. f. 

 1608.) Glabrous; stem erect, slender, branched, 2-4 dm. tall. Leaves thin, the 

 basal and lower ones long-petioled, obtusely crenate or somewhat lobed, 1-3.5 cm - 

 wide, cordate, truncate at the base, the upper sessile or nearly so, deeply 3- cleft or 

 3-parted into linear or narrowly oblong segments; flowers bright yellow, 12-18 mm. 

 broad; petals 4-8, 4 or 5 times as long as the reflexed sepals; head of fruit globose, 

 4 mm. in diameter; achenes oblique, compressed, tipped with a minute straight 

 style. On dry hillsides. Mo. and Ark. April-May. 



17. Ranunculus abortivus L. Kidney-leaved Crowfoot. (I. F. f. 1609.) 

 Glabrous, or but sparingly pubescent. 1.5-6 dm. high, branched. Basal leaves 

 long-petioled, bright green, thick, crenate or sometimes lobed, broadly ovate, 

 obtuse, and generally cordate or reniform, the cauline sessile or nearly so, divided 

 into oblong or linear somewhat cuneate lobes; receptacle short, pubescent; flowers 

 4-6 mm. broad. In woods and moist grounds, Newf, Lab. and N. S. to Manitoba, 

 Fla., Ark. and Colo. April- June. 



Ranunculus abortivus euc^clus Fernald. Stem and branches more slender, the 

 latter flexuous ; leaves thin, shining, some of the basal ones orbicular ; flowers and 

 achenes smaller. Me. and Quebec to Mass. 



18. Ranunculus micranthus Nutt. Rock Crowfoot. (I. F. f. 1610.) 

 Similar to the preceding species but usually smaller, villous with spreading hairs, 

 flowering when very young, 1.5-4 dm. tall. Leaves thin, dull green, the basal 

 ones ovate or suborbicular. 3-lobed or crenate, narrowed, rounded or subcordate at 

 the base; segments of the upper leaves narrow; flowers about 6 mm. broad; sepals 

 narrowed into a short claw; head of fruit rather longer than [hick, the receptacle 

 linear, glabrous or very nearly so. In rich woods, often on rocks, range appar- 

 ently nearly that of A', abortivus. Roots tuberous. April- May. 



