6 1. EANirTfOUI.ACEa!. 



ments spreading in the segment of a sphere, rarely wanting. 

 Receptacle hispid. — (The submersed leaves become stiflF 

 when old. The younger ones should be examined.) 



1. R. trichophyl'lus (Ohaix) ; submersed I. (blackish green) 

 closely trifurcate not collapsing into a pencil (tassel-like) when 

 taken from the water, segments short rigid, ped. not tapering 

 about equalling the 1., fl. small, pet. obovate 5 — 7 -veined not 

 contiguous evanescent, stig. oblong, receptacle globular, carp. 

 J-obovate laterally apioidate compressed. — JE. B. S. 2968. St. 

 67. 11. — St. not rising out of the water. Upper 1. sessile, all 

 dense. Floating 1. very rare (when it is R. Oodronii Gren. ! 

 and also R. radians Rev. ! and perhaps R. triphyllos Wallr.). 

 •Stip. 4-adnate, large, round, auricled. Fr.-ped. short, thick, 



arching, most curved near their base. Suds globose. Fl. star- 

 like. Stam. exceeding the pistils. Stig. short but lengthening. 

 Receptacle as thick as peduncle. Carp, a little narrowed at the 

 end. — Ponds and ditches. P. V. VI. Water Fennel. E. I. 



2. R. Drouet 'ii (F. Schultz) ; submersed I. (light green) rather 

 loosely trifurcate, tassel-like segments flaccid, floating 1. (rare) 

 tripartite with subsessile or stalked wedgeshaped bifid segm., 

 ped. not tapering about equalling the 1., fl. small, pet. obovate 

 5 — 7-veined not contiguous evanescent, stig. oblong, receptacle 

 oblong, carp. J-obovate sublaterally apioulate inflated at the end. 

 — E. B. S. 2967. — Bright green. St. not rising out of the 

 water. Upper 1. nearly or quite sessile. Floating 1. rare, 

 evanescent ; lateral segm. stalked and in a different plane from 

 the visually sessile deflexed middle segm. Stip. much adnate, 

 large, auricled. Fr.-ped. short, slender, bent at the base, nearly 

 straight above. Buds ohlmig. Fl. starlike. Stam. exceeding 

 the pistils, few. Fr.-receptacle as thick as peduncle. Carp, 

 with the edge flattish at the end, base of style small often sub- 

 central.— Ponds and ditches. P. V. ^1. E. 



3. R. heterophyl'lus (Fries) ; submersed I. loosely trifurcate, 

 segments long tassel-like, floating 1. subpeltate tripartite with 

 sessile or stalked wedgeshaped 3 — 6-lobed segm., ped. not taper- 

 ing but narrowed scarcely exceeding the 1., fl. large, pet. broadly 

 cuneate-obovate 7 — Q-veined not contiguous persistent, stig. ob- 

 long, receptacle conical, carp, ^-obovate laterally pointed. — R. 

 aquatilis Sm. H. B. 101. — St. not rising out of the water. 

 Fr.-ped. slender, cm-ved near their base, nearly straight above. 

 Floating 1. nearly circular. Stip. much adnate. Buds slightly de- 

 pressed and rather pentagonal. Fl. becoming star-like. iStam. 

 many, exceeding pistils. Style hooked. Carp, blunt, inner 

 edge straight. — ji. submersus, floating 1. 0, submersed 1, more 

 dense and often rather less flaccid, fl. large, stam. many. — Ponds 

 and streams. P. V. VI. E. I, 



