RANUNCULACEAE. 



143 



Some of the basal leaves entire. 

 None of th^e leaves entire. 



Plants neither immersed in the water nor creeping in the mud, if rooting 

 at the nodes, not with palmately lobed or dissected leaves. 

 Achenes turgid, marginless. ' 



Petals much exceeding the sepals. 



Basal leaf-blades not divided to the base. 

 Basal leaf-blades divided to the base, 2-3 times ternate. 

 Petals scarcely exceeding the sepals. 

 Achenes compressed with a distinct margin. 



Beak of the achenes distinctly hooked. Recurvati. 



Beak of the achenes straight or nearly so. Repentes. 



Plants immersed in the water or creeping in the mud ; leaves palmately 

 lobed, divided or dissected. Multifidi. 



Glaberrimi. 



Affines. 



Triternati. 



Abortivi. 



Flammulae. 



Stem filiform, prostrate, rooting at the nodes. 

 Stem not iiliform, erect or ascending, not rooting. 



Petals distinctly clawed; beak of the achenes stout. 



Petals not clawed ; beak of the achenes filiform. 



NiVALES. 



Leaf-blades spatulate or elliptic, 2-4-toothed at the apex. 



1. R. reptans. 



2. R. unguiculatus. 



3. R. alismaef alius. 



4. R. Macauleyi. 



Glaberrimi. 

 Basal leaf-blades elliptic to oval, usually all entire. 



5. R. ellipticus. 



Affines. 



Achenes pubescent ; heads oblong to cylindric. 



Basal leaf-blades or some of them merely crenate ; the rest 3-cleft at the apex 

 with a narrow middle lobe. 

 Petals broadly obovate, about i cm. long ; sepals densely villous. 



6. R. cardiofhyllus. 

 Petals oblong-obovate, 3-6 mm. long ; sepals not densely villous. 



Petals 5-6 mm. long ; head of achenes oblong. 7. R. inamoenus. 



Petals 3-5 mm. long ; head of achenes cylindric. 8. R. micropetahis. 



Basal leaf-blades all digitately or pedately cleft with acute lobes. 



g. R. afUnis. 

 Achenes glabrous. 



Plant glabrous, except the sepals. 



Lobes of the stem-leaves elliptic, oval or obovate. 10. R. Eschscholtsii. 



Lobes of the upper, stem-leaves linear to oblong. 



Basal leaf-blades orbicular, seldom reniform, seldom cleft more than half- 

 way down ; heads of fruit decidedly oblong ; stipules semi-circular, about 

 2 mm. long. 11. if. alpeophilus. 



Basal leaf-blades decidedly reniform, cleft deeper than half-way down ; 

 heads of achenes spherical or nearly so ; stipules of the stem-leaves oval, 

 3-4 mm. long. 12. R. ochreatus. 



Plant more or less pubescent. 13- R- ovalis. 



One species. 



Triternati. 



Abortivi. 



Basal leaf-blades, at least some of them, merely crenate. 

 Achenes pubescent ; heads of achenes cylindric. 

 Achenes glabrous ; heads spherical. 



14. R. adoneus. 



8. R. micropetahis. 



