520 RANUNCULACEAE 
III. ABORTIVI 
Basal leaves with all or some of the blades crenate: stem 
not hollow 
Style very short. i 
Basal Aa with cordate blades: foliage glabrous 
or ne SO. 8. R. abortivus. 
Basal leave with truncate or cuneately narrowed 
blades: foliage pubescent. 9. R. micranthus. 
d S NE hooked nearly 4% as long as the achene- 
10. R. P ue 
Basal leaves with all blades lobed or divided: stem hollow. 11. R. sceleratu 
IV. RECURVATI 
Leaf-blades with broadly cuneate lobes. 12. R. recurvatus. 
V. TES 
Achene with a beak less than % as long as the body. 
Petals about as long as the sepals: head of fruit ellip- 
soid or cylindric. 13. R. pennsylvanicus. 
Petals much longer than the sepals: head of fruit sub- 
globose. 
Stem spreading and creeping, stoloniferous. 14. R. repens. 
Stem erect, not stoloniferous 
Sepals spreading: leaf-blades digitately divided. 15. R. acris. 
Se mals reflexed : leaf-blades pun divided. 16. R. bulbosus. 
Pn with à bea ak over % as long as the body; beaks 
ee partially deciduous. 
Garpels or achenes Ai 17. R. palmatus. 
Carpels or achenes nu 
lant eiolonifercad S foliage glabrous or nearly so. 18. R. septentrionalis. 
Plant not stoloniferous : trn copiously pubescent, 
except sometimes i 
Stem with silky or appressed IE Meenem 19. R. fascicularis. 
Stem with spreading pubesc 20. R. hispidus. 
VI. MURICATI 
Achene more or less papillose; beak minute. 
M eps s E em. ronda achene sparingly papillose near 
1. R. parvulus. 
Coroll SOB mm. broad: achene papillose all over. 22. R. parviflorus. 
E id siete or spiny; beak about % as long as the 
body. 23. R. muricatus. 
2 R. delphinifolius Torr. Stem mostly glabrous, 1-6 dm. long: blades of the 
ersed leaves smaller than those of the ree petals 5-8, 8-16 mm. long: 
head of fruit au Ses to nearly glo 
achene-body about 2 DEN wide- dence 
below, the. be ok : ally 1 long as the e» (p ) 
body.—( WATER-BUTTERCUP. ) —Ponds, various S 
to 
provinces, rarely astal 2 N. 
Kans. , Mi ch., Ont., and Mass.—Sum. 
2. R. tener C. Mohr. Stem glabrous, 0.5-6 
dm. t Nu blades Hg the Ad leaves ovate to 
late, 1-3.5 e 
ovate-lanceo m. long, those of the 
upper ones much narrower: pe —3, or 
arely 5, 1- lon ad of' fruit 
D to ellipsoid, 1.5-2.5 mm. thick: 
a ody obovoid, n long, 
scar ee beaked. [R. trachyspermus Engelm 
no EIL p and low woods, Coastal Plain, and adj. provinces, Ala. to 
3. - Lindheimeri Engelm. Stem mostly glabrous, 1-4 dm. tall: blades of the 
lower leaves ovate to elliptic, 1-3 cm. long, those of the upper leaves narrower: 
Peu mostly 1-3, 1-2 mm. long: head of fruit ovoid to globose, 2-3 mm. thiek: 
