8 1. BAlf[7IfCT7LA.OB^. 



halfway down, more than semicircular ; outer base of lateral 

 segments much roimded ; rarely with stalked segments. Stip. 

 broad, with a free rounded end. Fl. starlike. Stam. 20 — 30. 

 Style recurved. Receptacle as thick as peduncle. Inner edge 

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



8. R. penicillatus (Hiern) ; submersed 1. loosely trifurcate 

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

 long-stalked subpeltate ^-trifid 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 

 pistils, stigma . . . ., receptacle spherical, carp, ^obovate very 

 blunt.^ — B. penicillatus (Dum.). It. pseudo-Jluitans (ed. 6). — St. 

 wholly submersed. Floating 1. semicircular or broader than 

 long, outer base of lateral segments much rounded. Often there 

 are no floating leaves, when it seems to be the B. aquatile, /3. 

 rimtlare (Schur), M. pseudo-fluitmis (Hiern). Submersed 1. 

 often 3 — 4 in. long with the segm. lying close together almost 

 as in B,.fluitans, flaccid and wMp-shaped. In water, especially 

 streams. P. V.— VIII. E.I. 



9. R. peltdtus (Fr.) ; submersed 1. loosely trifurcate, segments 

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

 subpeltate nearly half 3 — 5-fld vnth obovate segments having 

 2 or 3 notches, ped. tapering exceeding the leaves, fl. large, pet. 

 round becoming obovate-cuneate 9-veined contiguous persistent, 

 stam. many exceeding pistils, stigma elubshaped, receptacle 

 ovoid, carp. -J-obovate very blunt. — E. B. 8. 2965. ;Si!. 67. 7. 

 B. truncatum Dum. — Floating 1. |-eircular, convex, outer base 

 of lateral segments much rounded. Stip. adnate nearly through- 

 out. Fl. sweet-scented, very large. Stam. about 30. Style 

 curved. Receptacle small. Inner edge of carp, nearly straight. 

 — R. elongatus (Hiern !), B. elongatum (Schultz) has very muc£ 

 longer ped. but otherwise does not seem to difier, except that 

 the l.-segm. are rather less ligid. — In water and wet places. 

 P. V.-fx. ^E. S. 



_ 10. R. intermedins (Knaf, Hiern) ; divided 1. rare rather 

 rigid not collapsing, floating or aerial, floating 1. subpeltate 

 deeply trifid with cuneate-obovate 2 — 4-fid lobes, pet. scarcely 

 exceeding the cal, style subulate terminal with a slender base, 

 carp, unequally obovate much inflated with a nearly terminal 

 point.— 22. tripartitus (DC.) R. B. & 2946.— St. usually sub- 

 erect, aerial. L. f-circular, lateral lobes with 3, middle with 

 2— 4 crenatures. Upper stip. free. Pet. pinkish. Stam. 5— 10. 

 Style deciduous. Inner edge of carpels much rounded. — Damp 

 ground and wet ditches, rare. A. V. — ^VIII. E. 



