RANUNCULACEAE. 143 



Some of the basal leaves entire. Glaberrimi. 



None of the 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. Affines. 



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

 Petals scarcely exceeding the sepals. Abortivi. 



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. 



Flammulae. 



Stem filiform, prostrate, rooting at the nodes. i. R. rcptans. 

 Stem not filiform, erect or ascending, not rooting. 



Petals distinctly clawed ; beak of the achenes stout. 2. R. unguiculatus. 



Petals not clawed ; beak of the achenes filiform. 3. R. alismaef alius. 



N I VALES. 



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



Glaberrimi. 

 Basal leaf-blades elliptic to oval, usually all entire. 5. R. elHpticns. 



Affixes. 



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. cardiophylhis. 

 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. micropetalus. 



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



9. R. afUnis. 

 Achenes glabrous. 



Plant glabrous, except the sepals. 



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



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. R. alpeophilus. 



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

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

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



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



Triternati. 

 One species. 14. R. adonens. 



Abortivi. 



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



Achenes pubescent ; heads of achenes cylindric. 8. R. micropetalus. 



Achenes glabrous ; heads spherical. 



