A' A N UNCULA CEA E. 42 5 



2. Ranunculus delphinif olius Torr. Yellow Water-Crowfoot. (I. F. f. 

 1595.) Aquatic or partly emersed. Immersed leaves repeatedly divided into 

 capillary segments, short-petioled, 3-7 cm. long ; emersed leaves 1-5 cm. broad, 

 petioled or the upper nearly sessile, 3-5 -divided, the divisions cleft into linear or 

 cuneate segments; petals 5-8, much longer than the sepals; head of fruit globose 

 or oblong, 6-10 mm. long. In ponds, Me. and Ont. to Mich., south to N. Car., 

 Mo. and Kans. The so-called var. terreslris, appears to be an emersed form. 

 June-Aug. [A\ multifidus Pursh, not Forsk.] 



3. Ranunculus Missouriensis Greene. Missouri Buttercup. (I. F. f. 

 1597.) Perennial, sparingly pubescent; stems slender, decumbent, leafy, 3 dm. long 

 or more, rooting at the lower nodes. Leaves usually wider than long, thin, 3-7 cm. 

 wide, palmately divided into 3 obovate-cuneate incised and lobed segments, the 

 lobes obtuse; petals about 5; head of fruit oblong, about 8 mm. long; achenes 

 compressed, somewhat wrinkled. In ditches and on borders of lakes, Mo. to N. 

 Mex. July-Aug. 



4. Ranunculus hyperboreus Rottb. Arctic Buttercup. (I. F. f. 1598.) 

 Stem slender, glabrous, filiform, creeping, 5— 15 cm. long. Leaves petioled, 

 3-lobed or cleft, 4-8 mm. long, obtuse, the base cuneate or rounded, the lobes ob- 

 long, obtuse, the lateral ones sometimes toothed; flowers few, 4-6 mm. broad; 

 petals slightly shorter than the reflexed sepals; head of fruit globose, 4 mm. 

 broad; achenes slightly compressed, with a minute blunt tip. Lab., Arctic 

 Am., Iceland, northern Europe and Siberia. Summer. 



5. Ranunculus Lapponicus L. Lapland Buttercup. (I. F. f. 1599.) 

 Scapose from running rootstocks, 7-15 cm. high. Basal leaves long-petioled, the 

 blade 3-4 cm. broad, reniform, 3-parted, the divisions broadly obovate, cuneate, 

 obtuse, crenate or lobed ; scape i-flowered, slender, longer than the leaves; flower 

 6-10 mm. broad; petals 5-6; sepals generally fewer and reflexed; head of fruit 

 globose, 12 mm. broad; achenes flattened, ovate, with a slender hooked beak. 

 Lab.. Lake Nipigon and Thunder Bay, Lake Superior, northern Minn., Arctic 

 Am. and in northern Europe and Siberia. Summer. 



6. Ranunculus pusillus Poir. Low Spearwort. (I. F. f. 1600.) Slender, 

 weak, glabrous, branching, 15-30 cm. high. Lower leaves oblong or ovate, on long 

 petioles, the upper narrower, lanceolate or linear, short-petioled or sessile ; flowers 

 4-6 mm. broad, the petals few, often barely exceeding the sepals; head of fruit 

 globose, 4 mm. broad. Marshes, southern N. Y. and N. J., Penn., south to Fla., 

 and west through the Gulf States to Tex. and Mo. April-July. 



7. Ranunculus oblongifolius Ell. Oblong-leaved Spearwort. (I. F. f. 

 1601.) Branched above, erect or ascending, 3-5 dm. high, glabrous or pubescent. 

 Leaves oblong, or oblong-lanceolate, the lower on long petioles, the blade some- 

 times 7 cm. long, the upper narrower, lanceolate or linear; flowers 10- 12 mm. 

 broad, the 5 petals much exceeding the sepals; head of fruit 4 mm. broad. In 

 swamps, southern Va., southern 111. and Mo., south to Fla. and Tex. April-Sept. 



8. Ranunculus reptans L. Creeping Spearwort. (I. F. f. 1602.) The 

 flowering stems and peduncles ascending. Leaves linear, lanceolate or spatulate, 

 2-5 cm. long, mainly entire, gradually narrowed into the petiole; flowers 8-10 mm. 

 broad, solitary on peduncles 2-7 cm. long; petals 4-7, much exceeding the calyx; 

 achenes flattish; stamens numerous. On shores, Newf. and Arctic Am., south 

 to X. J., Perm, and Mich., and in the Rocky Mts. to Colo. Also in Europe and 

 Asia. Summer. 



Ranunculus reptans intermedius (Hook.) T. & G. Larger; leaves longer and 

 wider, 7-13 cm. long, 4-6 mm. wide. Newf. to the shores of the Great Lakes, and Ore. 



9. Ranunculus obtusitisculus Raf. Water Plantain Spearwort. (I. F. f. 

 1603.) Stout, 3-10 dm. high, ascending, glabrous; stem hollow, sometimes nearly 

 2 cm. thick at the base. Leaves lanceolate or oblong-lanceolate, 7-12 cm. long, 

 10-12 mm. wide, denticulate or entire, all but the uppermost on broad petioles; 

 flowers 12-16 mm. broad; petals 5-7, much exceeding the sepals; head of fruit glo- 

 bose or slightly elongated, 10-12 mm. in diameter; achenes I mm. long. Marshes, 

 Me. and Ont. to Ga., west to Minn, and Mo. June-Aug. [R. ambigens S. Wats.] 



10. Ranunculus nivalis L. Snow Buttercup, [i. F. f. 1604.) Stem 

 simple. 1-2 dm. high. Basal leaves long-petioled, 3-7-lobed, or crenate, thick, 

 glabrous, the blade about 2 cm. broad, those of the stem short-petioled or sessile, 



