RANUNCULACEAE 



325 



N. J. Rare and local in Hunterdon, Somerset and Union counties, 



thence increasing but not common northward. 

 Pa. Monroe, Northampton, Lehigh, Bucks, Montgomery, Berks 



and Chester counties. 



Tertiary, o: Cretaceous, o: Older Formations, increasing north of 

 the moraine. 1 17-175 days. Sea level-3,800 ft. 



18. Ranunculus [Tourn.] L. 



Aquatic, or creeping mud plants, or plants of swamps or muddy 

 shores. 

 Leaves orbicular, palmatcly divided. 

 Leaves entire or denticulate. 



Annual; achene beaklcss, tipped with the persistent 



style-base. 

 Perennial; rooting from the nodes; achenes beaked. 

 Stems trailing; achenes minutely beaked. 

 Stemsascending or erect ; achenes subulate beaked. 

 Terrestrial species with some or all of the leaves divided. 

 Achenes smooth, neither papillose nor spiny. 



Basal leaves, some or all of them, merely crenate. 

 Styles very short, curved. 



Basal leaves cordate; plant usually glabrous. 

 Basal leaves not cordate; plant villous. 

 Styles subulate, hooked, nearly }■£ as long as the 

 achene. 

 Leaves all lobed or divided. 



Plant glabrous; stem hollow; flower small. 

 Plant more or less pubescent. 



Beak of the achene strongly hooked. 

 Beak not hooked. 



Beak of the achene short. 



Erect plants naturalized in fields. 

 Calyx spreading; roots fibrous. 

 Calyx reflexed; stem bulbous- 

 thickened at the base. 

 Erect or ascending plant of moist 



places; flower 6-12 mm. broad. 

 Prostrate or somewhat ascending; 

 plant of fields; flowers about 25 

 mm. broad. 

 Beak of the achene long, stout or slender; 

 flowers 12-36 mm. broad. 

 Beak stout, sword shaped; leaves 



cuneate at the base. 

 Beak slender, subulate. 



Leaf segments broad, oblong. 

 Leaf segments narrow, linear- 

 oblong. 



I. R. delphinifolius. 



2. R. pusillus. 



3. R. reptans. 



4. R. obtusiusculus. 



5. R. abortivus. 



6. R. micranthus. 



7. R. allegheniensis. 



8. R. sceleratus. 



9. R. recurvatus. 



10. R. acris. 

 ir. R. bulbosus. 



12. R. pennsylvanicus. 



13. R. repens. 



14. R. septentrionalis. 



15. R. hispidus. 



16. R. fascicularis. 



