EANXTKCULTJS. 7 



4. R. confAsws (Godr.) ; submersed I. loosely trifurcate not 

 tassel-like, segments lon^ rather rigid, floating I. long-stalked 

 subpeltate subtripartite with sessile obovate 3 — S-lobed segments, 

 ped. slender gradually tapering exceeding tlie 1., fl. large, pet. 

 cuneate-obovate 7 — ^D-vemed not contiguous persistent, stig. 

 tongueshaped, receptacle ovoid-conic, carp, i-ovate compressed 

 and narrowed upxoards. — St. 82. 2. — Floating 1. semicircular, 

 flat, nearly tripartite, outer base of lateral segments rounded. 

 Stip. oblong, much adnate. Buds globular. Jl. starlike. Stam. 

 many, exceeding pistils. Style recurved.— Ponds and ditches, 

 especially near the sea; often in brackish vrater. P. VI. — IX. 



E. 



5. R. Bauddtii (Godr.) ; submersed 1. closely trifurcate, seg- 

 ments rather rigid not tassel-like, floatiag 1. long-stalked tri- 

 partite with sessile or stalked wedgeshaped 3 — 4-lobed segments, 

 ped. thick narrowed at the top exceeding 1., pet. 7-veined not 

 contiguous persistent, stam. not exceeding pistils, stigma tongue- 

 shaped, receptacle long-conic, carp. J-obovate inflated at the 

 end. — E. B. S. 2966. — Floating 1. nearly or quite tripartite, the 

 base of all the segments wedgeshaped ; or often of many linear 

 blunt segments. Stip. much adnate. Buds globular but a 

 little flattened at the top. Fl. starlike. Stam. 15 — 20. Style 

 straight, beaklike and persistent below, recurved above. Re- 

 ceptacle thicker than ped., very tall. Carp, very many. — 

 M. marinus (Fr.) is a form which wants the floating leaves. — 

 Slightly brackish water or near the sea. P. V. — VIII. 



E. S. I. 



6. B.florihuridus (Bab.) ; submersed 1. closely trifurcate, 

 segments rather rigid divaricate not tassel-like, floating 1. long- 

 stalked subpeltate J-trifid or tripartite with obovate 3 — 5-lobed 

 segments, ped. not tapering scarcely exceeding the 1., fl. large, 

 pet. obovate-cuneate 9 — many-veined not contiguous persistent, 

 stam. many exceeding pistils, dig. tongueshaped, receptacle 

 spherical, carp, ^-obovate very blunt. — A. N. S. ser. 2. xvi. 

 397. E. B. S. 2969. — Floating 1. convex, divided more than 

 halfway down, more than semicircular; outer base of lateral 

 segments much rounded ; rarely with stalked segments. Stip. 

 broad, with a free roimded end. Fl. stailike. Stam. 20 — 30. 

 Style recurved. Receptacle as thick as peduncle. Inner edge 

 of carp, nearly straight. — ^Ponds. P. V. — IX. E. 



7. R. penicillatus (Hiorn) ; submersed 1. loosely trifurcate 

 tassel- or whip-shaped siibsessUe, segments very long, floating 1. 

 long-stalked subpeltate J-trifld or tripartite with obovate seg- 

 ments, each having two or three notches, ped. very long exceed- 

 ing the leaves, fl. large, pet. broad becoming obovate-cuneate 

 9-veined contiguous persistent, stam. many exceeding the 



