206 Obdbr ].— BANUNCULACE^. 



4 R. Piirshll Kich. Floating: st. long; submerged Ivs., cleft into numerous 

 capillary segments, emersed ones niiiform, 3 — 5 parted, tlie lobes variously di- 

 vided ; Sep. reflexed, i as long as the yellow petals ; carpels smooth, with a short, 

 straiglit, ensiform style ; hds. globous. — Ponda, sluggish streams, and muddy 

 places, Can., U. S Stem 1 — 2f or more in length, fistulous. Lvs. pentangular 

 in outline, |^1^' diam., those below more finely divided ; petioles J — 2' in lengtli. 

 Fls. bright yellow, emerging on forked, striate peduncles. May, .Tn. 



13. Fi.uviATiLis. Lvs. all capillaceous-multifid ; fls. as large as in R. aoris. (R. 

 laeustris Beck ) 



5 R. Cymbalaria Ph. Si filiform, creeping, rooting ; lvs. reniform-cordate, cre- 

 nate-dentalAi ; ped. solitary, mostly 2-flowered ; petals spatulate; ach. oblong. — 

 In salt marshes on the sea-coast, and at Salina, N. Y. Stem round, sending out 

 runners from the joints. Lvs. radical, ^ — 1' diam. on long petioles. Scapes 

 2 — 6' high, each with 2 small, bright-yellow flowers, and as many obtuse bracts. 

 Nectary naked (not covered by a scale). Jn. 



6 R. r^ptans L. Stem creeping, geniculate, rooting; nod^s 1-flowered; lvs. lin- 

 ear, entire, remote. — A slender species, creeping on river banks and other wet 

 places, Can., N. IL, "W. to Oregon. Stem 6 — 8' long, round, rooting at ths 

 joints. Lvs. fleshy, 6 — 12" in length, mostly very narrow and acute at each 

 end. Pis. small (3 — 4" wide). Sepals spreading, obtuse. Petals obovate, yel- 

 low, fading to white. Nectary covered by a scale. Ach. very smooth. Jl. (E. 

 flliformis Mx.) 



p. OVALIS. Lvs. oval and lanceolate ; pet. 5 — 10. 



7 R. riammula L. SpeaetvORT. Stem declin.it6 at base, erect ; lvs. all lanco- 

 shaped, on sheathing petioles. — An aquatic herb, growing in ditches and swamps, 

 Can. to N. Car., W. to IlL Root fibrous. Stem 6 — 18' long, more or less de- 

 cumbent, succulent. Lvs. 3 — 6' in length, entire, or with a few teeth, thick- 

 ened at the acute summit. l?ls. solitary, of a golden yellow, on peduncles J as 

 long as the leaves. Fruit roundish, twice longer than its beak, iu a globular 

 head Jn., Aug. (R. alism^foliua Geyer.) 



8 R. pusfUns Poir. Erect; lvs. all peticlate, lower ones ovate, upper ones litiear- 

 lanceolate; pet. mostly but 3 scarcely longer than the calyx; stam. 8 — 10 ; carpels 

 ovate, scarcely pointed. — In wet grounds, N. T. to Ga. and La. Stems slender, 

 weak, 6 — 12' high, dichotomously branched. Lower lvs. subcordate, J — 1' long. 

 J as wide, petioles 1 — 3" long, upper ones 1 — IJ" long, ^ as wide, with minute, 

 remote teeth. Fls. very small, yellow, on long peduncles. May. 



9 R. Tex^nsis Engl. Texas Ceowfoot. Erect, diffuse, branched; lvs. lance- 

 ovate and lanceolate ; fls. minute, stam. about 20. — La. and Tex. Glabrous, or stem 

 puberulent, 12 — 18' high, dividing above in numerous slender branches and pe- 

 duncles. Lvs, petiolate, denticulate, upper linear. Fls. numerous, petals yellow, 

 less than 1" long. Carp, minute, pointless, in round heads. 



10 R. abortivus L. Smooth ; radical lvs. roundish, cordate, crenate, petiolate ; cai 

 a little longer than petals, reflexed. A very pretty species in woods, Can. to 

 Ark., remarkable for the dissimilarity of the root and stem leaves. Stem 8 — 16' 

 high, nearly naked. Root lvs. 8 — 18" diam., quite regularly margined with cren- 

 ate divisions, and on petioles 2 — 5' long. Lower stem lvs. pedate, with a pen- 

 tangular outline ; upper in 3 deep, linear segments, sessile. Fls. small, yellow. 

 Fruit in globous heads. May, Jn. 



p MICRANTHUS. Hairy, low (3 — 5') ; lower lvs. scarcely cordate, 3-lobed or 3- 

 cleft. Fls. 1 or 2. Mass. (Sprague) to Ga. I (R. micranthus, Nutt.) 



11 R. rhomboideus Goldie. Mrsuidy pubescent, much branched; root lvs. 

 rhomboid-ovate, crenate- dentate, on long petioles; sep. spreading, shorter than the 

 petals ; ach. smooth, with very short beaks. — Wis. (Lapham) and Can. W. A 

 low, bushy, hairy species, 6 — 10' high. Root lvs. about 1' by f, often roundish 

 or elliptical, the petioles about 2' long. Segments of the stem leaves linear- 

 oblong, obtuse, oftener entire. Petals yellow, oblong- obovate. Heads of carpels 

 globous. (R. ovalis and brevicaulis. Hook.) 



12 R, fasciculdris Mnhl. Eaely Crowfoot. Erect; root fasciculate; radical 

 lvs. appearing pinnate ; peduncles terete ; carpels scarcely margined. — Rocky woods 



