O . RANUNCULACE^. 



4. R. pusilliis Pursh. : stem erect or decumbent ; leaves petioled ; lower 

 ones ovate and subcordate, entire or sparingly toothed ; upper ones linear- 

 lanceolate ; pedicels opposite to the leaves, solitary, 1-flowered ; carpels 

 smooth, with a minute blunt point. 



Wet grounds. N. J. to Geor. and Louisiana. June. Aug. %. — Stems 

 6 — 12 inches high, weak. Flowers small, pale-yellow. Distinguished from 

 R. Fammula by its smaller size, and by its lower leaves being ovate. Accord- 

 ing to Dr. Torrey, a variety, (muticus,) in which the carpels are destitute of a 

 beak, occurs in the low grounds of Bloomingdale, about five miles from the 

 City Hall. The same variety is also found in Chester co. Penn. Darlingt. Fl. 

 Cest. Small-flowered Crowfoot. 



5. R. Cymbalaria Pnrsh. : stoloniferorus ; leaves petiolate, smooth, some- 

 what fleshy, cordate, reniform or ovate, coarsely crenate; scape 1 — 3 

 flowered ; petals spatulate, longer than the calyx ; carpels ovate, ribbed, 

 in oblong heads. R. Cymbalaria, va/. Americanus D. C. 



Salt marshes. N. Y. Mass. Can. to lat. 68° N., and from Hudson's Bay to 

 the summits of the Rocky Mountains, where it does not appear to be confined 

 to salt marshes. July, Aug. %. — Scapes 2 — 6 inches high. Flowers small. 

 Fruit oblong. Its runners are very properly compared by Dr. Smith, to those 

 of the garden strawberry. Sea Crowfoot. 



ff Leaves divided. 



6. R. aboriivus Linn. : smooth ; radical leaves petiolate, cordate-orbicu- 

 late, crenate, sometimes 3-parted; cauline ternate and 3 — 5-cleft, with 

 linear-oblong nearly entire segments ; upper ones sessile ; sepals a little 

 longer than the petals, reflexed. 



Wet grounds. Throughout the U. S. and Can. to lat. 57° N. W. to the 

 Rocky Mountains. May. %. — Stem a foot high, simple or branching, smooth. 

 Leaves very variously dissected, mostly smooth. Flowers small, yellow, the 

 petals being sometimes longer than the calyx. Carpels compressed, forming an 

 ovate or nearly globose head. R. nitidus of Walter, is a variety of this species, 

 differing only in size, being nearly twice as large. Kidney-leaved Crowfoot. 



7. R. scelerahis Linn. : smooth ; radical leaves petioled, 3-parted, the seg- 

 ments lobed ; cauline ones 3-lobed, lobes oblong, linear, entire ; sepals re- 

 flexed, about equal to the petals ; carpels small, numerous, forming a cylin- 

 drical head. 



Wet grounds. From lat. 67° N. to Car. May— Aug. '^.—^^em a foot high, 

 branched, succulent. Flowers small. Petals pale yellow. Head sometimes 

 an inch in length. The plant is almost entirely glabrous. 



Celery-leaved Crowfoot. 



8. R. Purskli Richardson : submerged leaves 2 — 3-chotomously divided, 

 with the segments flat and filiform ; emersed ones reniform, 3 — 5-parted, 

 the lobes variously divided ; petals 5 — 8, obovate, twice as large as the re- 

 flexed sepals ; carpels in globose heads. R. muUifidus Pursh. R. lacustris 

 Beck tf* Tracy. 



Ponds and muddy places. Arct? Amer. to Car. W. to the Rocky Mountains. 

 May — ^July. %. — Stem 1 — 4 feet long. Leaves varying with the place of 

 growth, from being all divided into numerous filiform segments, to all rounded 

 or reniform, and cleft into 3 — 5 lobes. Flowers large, shining, bright yellow. 



Pursh' s Crowfoot. 



9. R. acris Linn. : leaves mostly pubescent, 3 — 5 parted ; lobes incisely 



