8 1. rantjnculacejE. 



with repeatedly and closely forked rigid segments all placed m 

 one roundish plane not collapsing, ped. much narrowing exceed- 

 ing 1., fl. large, pet. obovate many-veined nearly contiguous per- 

 sistent, stam. exceeding pistils, stigm. cylindrical, receptacle ob- 

 long, carp, i-ovate compressed rather acute. — E. B. S. 2869.— 

 St. submersed. L. sheathing, not auricled, remarkably flat rigid 

 and formal. Buds depressed. Stam. 15—20. Receptacle nar- 

 rower than ped. Inner edge of carp, nearly straight. — Streams 

 and ponds. P. VI.— VIII. 



10. R.fluitans (Lam.); 1. all submersed about twice trifur- 

 cate with very long linear twice or thrice forked nearly parallel 

 segments, ped. narrowing, fl. large, pet. broadly obovate many- 

 veined contiguous persistent, stam. falling short of pistils, stig. 

 cyUndiical, receptacle eonical,carp. obovate inflated much rounded 

 at the end laterally apiculate. — E. B. S. 2870. — St. submersed, 

 usually very long. Petioles and segments of 1. often very long, 

 together a foot in length. Stip. broadly lanceolate. Buds shortly 

 pyramidal, pentagonal. Pet. often more than five. , Stam. very 

 short, many. Inner edge of carpels slightly rounded. — Rivers. 

 P. VI. VII. 



*** No submersed leaves. Receptacle not hispid. 



11. R. ccenosus (Guss.); 1. all roundish cordate with 3 — 5 

 rather deeply divided lobes which widen from their base, pet. ex- 

 ceeding cal., style terminal upon the ovate-conical ovarj'', carp, 

 unequally obovate with a terminal point. — R. Lenormandi E. B. S. 

 2930. — St. floating or creeping upon mud. L. not spotted ; 

 lobes very broad at the top, mostly with 2 — 3 notches. Upper 

 stip. very broad, i-adnate. Pet. narrow, obovate, 5-veined. 

 Stam. 8 — 10. Style nearly central on the ovary and usually so 

 on the carpel. Inner edge of carp, much rounded towards the 

 top. — Shallow ponds or mud. P. VI. — VIII, 



12. R. hederaceus (L.) ; 1. all roundish reniform with 3 — 5 

 shallow rounded lobes widening to their base, pet. scarcely ex- 

 ceeding cal., style prolonging the inner edge of the ovary, carp, 

 i-oval or 4-obovate with a lateral point. — E. B. 2003. — St. float- 

 ing or creeping upon mud. L. usually spotted; lobes usually 

 entire or with a central notch, often rather triangular. Stip. 

 narrow, much adnate. Pet. narrow, 3-veined. Stam. 6 — 8. 

 Style lateral upon both ovary and carpel. Inner edge of carpel 

 nearly straight. — Shallow ponds or mud. P. VI. — IX. 



B. Fr.-st. straight, carp, transversely wrinkled on the middle of 

 each side, nect. naked. 



13. R. sceleratus (L.) ; root fibrous, lower 1. stalked tripar- 

 tite, segments blunt crenate, upper 1. trifid Unear entire or incise- 



