8 1. ■Ri.NXmCVLi.CEM, 



pistils, stigma . . . ., receptacle spherical, carp. |-obovate Tery 

 blunt. — £. penicillatus (Dum.). It. pseudo-fluitans (ed. 6). — St. 

 wholly submersed. Floatiug 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, /i. 

 rimlare (Schur), R. pseudo-fluitans (Hiem). Submersed 1. 

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

 as in E.flnitans, flaccid and whip-shaped. — In water, especially 

 streams. P. V.— Mil. E. I. 



8. R. pelidtus (Fr.) ; submersed 1. loosely trifurcate, segments 

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

 subpeltate nearly half 3 — 5-fld with 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, stig-ma olubshaped, receptacle 

 ovoid, carp. J-obovate very blunt. — H. S. S. 2965. <S^. 67. 7. 

 B. truncatum Dum. — Floating 1. f-circular, convex, outer base 

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

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

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

 — R. elongatus (Hiem !), B. elongatum (Sehur^ has very much 

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

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

 P. v.— IX. E. S. 



** Submersed 1. not as in Section*. — t Receptacle hispid. 



9. R. circindtus (Sibth.) ; 1. all submersed and sessile trifur- 

 cate with repeatedly and closely forked rigid segments allphced 

 in one roundish plane not tassel-like, ped. tapering exceeding 1., 

 fl. large, pet. obovate many-veined nearly contiguous persistent, 

 Btam. exceeding pistils, stag, cylindrical, receptacle oblong, carp, 

 ^-ovate compressed rather acute. — E. B. 8. 2869. — St. sub- 

 mersed. L. sheathing, not auricled, forming a flat rigid disk. 

 Buds flattened at the top. Stam. 15 — 20. Receptacle narrower 

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

 ponds, but not common. P. VI. — VIII. E. S. I. 



tt Receptacle not hispid. 



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

 cate with very long linear txoice or thrice forked nearly parallel 

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

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

 cylindrical, receptacle conical, carp, obovate inflated much 

 rounded at the end laterally apiculate. — R B. S. 2870. — St. 

 submersed, usually very long. Petioles and stout segments of 

 1. often very long, together a foot in length. Stip. broadly Ian- 



