Feb., 1917] The Croivfoot Family in Ohio 107 



4. Petals flat, with a small pit or cup; carpels usually numerous. 5. 

 4. Petals narrow, cup-shaped, or tubular at base; carpels usually 



fewer than 8. 7. 

 o. Petals yellow; leaves usually not finely dissected. G. 

 .1. Petals white; leaves usually very finely dissected. Batrachium. 

 (). Sepals 5; flowers not scapose. Ranunculus. 

 (). Sepals 3; flowers scapose. Ficaria. 

 7. Carpels united; flowers with an involucre of dissected leaves. 



Nigella. 



7. Carpels separate. 8. 



8. Petals long spurred; leaves ternately decompound. Aquilegia. 



8. Petals small, cupshapcd, not projected backward into a spur. 9. 



9. Flower stem leafy; leaves lobed or divided irregularly. 10. 



9. Flowers on slender leafless scapes; leaves compound with three 



leaflets. Coptis. 

 10. Petals narrow, linear, with a nectariferous pit at the base; carpels 9 

 or more. Trollius. 



10. Petals small, green, tubular cups; carpels usually fewer than 8. 



HeUehoriis. 



1 1 . Leaves alternate or whorled. 12. 



11. Leaves large, opposite, compound, twining; our species slightly 



woody climbers. 20. 



12. Flowers yellow; leaves simple, entire, renifomi or cordate. Caltha. 



12. Flowers not yellow; leaves compound, lobed, or dissected. 13. 



13. Flowers solitar}^ umbelliferous or paniculated. 14. 



13. Flowers in large branched or simple racemes. 19. 



14. Scapose flowers with three sepal-like bracts immediately below the 



flower. . Hepatica. 



14. Not with sepal-like bracts immediately below the flower. 15. 



15. Flowering stem with two alternate, palmately lobed leaves; flowers 



solitar}'; perianth deciduous. Hydrastis. 



15. Flowering stem with an involucre or with more than two alternate 



leaves. 16. 



16. Flowers solitary or few in an umbel. 17. 



16. Flowers in large, tenninal panicles; often diecious. Thalictrum. 



17. Flowers umbellate or solitary subtended by a definite involucre. 18. 



17. Flowers not involucrate; ovules several. Isopyrum. 



18. Carpels very numerous; each flower usually solitary on a large 



peduncle, subtended by an involucre. Anemone. 



18. Carpels 4-15; flowers usually umbellate. Syndcsmon. 



19. With one carpel, petals spatulate or narrow. Actaea. 



19. With 1-8 carpels, petals 2-lobed or none. Cimicifuga. 



20. Flowers panicled; sepals and stamens recurved or spreading. 



Clematis. 

 20. Flowers usually solitary; .sepals and stamens erect. Viorna. 



