140 RANUNCULACEAE 



b. Perennial : stems creeping, at least near the base : achenes beaked. 

 Achenes minutely beaked : stems trailing. 4. R. reptans. 



Achenes subulate-beaked : stems erect or ascending. 



5. R. obtnsiusculus. 

 B. Terrestrial plants : leaves with all or some of the blades lobed or divided. 



Basal leaves with all or some of the blades crenate. 

 Style very short. 

 Basal leaves with cordate blades : foliage glabrous or nearly so. 



6. R. abortivus. 

 Basal leaves with truncate or cuneately narrowed blades ; foliage 



pubescent. 7. R. micranthus. 



Style subulate, hooked, nearly M. as long as the achene-body. 



8. R. Allegheniemis. 

 Basal leaves with all blades lobed or divided. 



Foliage glabrous : stem hollow ; flowers relatively small. 



9. R. sceleralus. 

 Foliage more or less pubescent :stems not hollow : flowers relatively 



large. 

 Beaks of the achenes hooked. 10. R. recurvatus. 



Beaks of the achenes straight or slightly curved. 



Achenes with beaks less than M. as long as the achene-bodies. 

 Petals about as long as the sepals : head of fruit oblong or cylindric. 



11. R. Fennsylvanicus. 

 Petals much longer than the sepals : head of fruit subglobose. 



Plants spreading and creeping, stoloniferous. 



12. R. repens. 

 Plants erect, not stoloniferous. 



Sepals spreading. 13. R. acris. 



Sepals reflexed. 14. R. bulbosus. 



Achenes with beaks over }4 as long as the achene-bodies, the beaks 

 sometimes partially deciduous. 

 Plants stoloniferous : foliage glabrous or nearly so. 



15. R. septentrionalis. 

 Plants not stoloniferous : foliage copiously pubescent except some- 

 times in age. 



Stems with silky or appressed pubescence. 



16. R.fascicularis. 

 Stems with spreading pubescence. 17. R. hispidus. 



1. Ranunculus Furshii Richards. Pursh's Buttercup. (Man. p. 

 424; I. F.y. 1596.) In moist soil, Mich, and Mian, to western Ont., Pa. 

 and Arctic Am., west to B. C, south in the Rocky Mts. to Colo, and Utah. 

 — Pennsylvania : Franklin ; Dauphin ; Huntingdon. 



2. Ranunculus delphinifoliua Torr. YELI.OW Water-crowfoot. 

 (Man. p. 425 ; I. F./. 7595.) In ponds, Ont. to Mich., N. C. and Mo. — 

 Pennsylvania : Huntingdon, barrens. 



3. Ranunculus pusillus Poir. Low Spearwort. (Man. p. 425 ; I. 

 F. /. j6oo.) In marshes, N. Y. and N. J. to Mo., Fla. and Tex.— Penn- 

 sylvania : Bucks ; York ; Frankun ; Chester. 



4. Ranunculus reptans L. Creeping Spearwort. (Man. p. 425 ; 

 I. F.y. /602. ) On shores, Newf. and Arctic Am., to N. J., Pa. and Mich., 



