6a. Flowers blue, irregular, with one spur (4 8 dm. high, sum- 

 mer) Larkspur, Delphinium aiacis, 



6b. The five petals each prolonged into a spur; flowers showy 



(48 dm. tall) (Columbine) 7. 

 6c. Flowers regular, without spurs 8. 



7a. Spurs nearly straight; flowers scarlet and yellow (spring) 



Wild Columbine, Aquilegia canadensis. 



7b. Spurs strongly incurved; flowers blue or white (spring, early 

 summer) Columbine, Aquilegia vulgaris. 



8a. Flowers yellow 9. 



8b. Flowers of various colors, but never yellow 28. 



9a. Petals none; sepals petal-like; leaves crenate or dentate (2 4 

 dm. high, flowers in early spring) Cowslip, Caltlia palustr'4. 



9b. Petals small; sepals petal-like; leaves deeply palmately lobed 

 (4 6 dm. tall; flowers in late spring) 



Globe-flower, Trollins laxus. 



9c. Petals yellow; sepals green or yellowish 10. 



lOa. Leaves linear to narrowly oblong, entire or with minute 

 teeth (flowers 10 15 mm. wide, in summer) 11. 



lOb. Leaves broader, some or all of them lobed or divided, or 

 cordate-ovate and not lobed 12. 



lla. Stems ascending (4 8 dm. high), rooting at the lower joints; 

 fruits pointed with a long slender beak 



Spearwort, Ranunculus laxicanlis. 



lib. Stems prostrate and trailing, rooting at the joints; fruits tipped 

 with a minute short beak 



Spearwortj Ranunculus flammula var. reptans. 



12a. Basal leaves, or most of them, merely serrate or crenate, 



and not obviously lobed 13. 

 12b. All the leaves lobed or divided 16. 



13a. Stem-leaves resembling the basal ones, and not lobed (1 2 dm. 

 high; summer) Sea-side Crowfoot* Ranunculus cymbalaria, 



13b. Stem-leaves deeply divided into oblong or linear 'segments 14. 



14a. Flowers 1.5 cm. wide or more (1 3 dm. high; spring) 



Buttercup, Ranunculus rhomboideus* 



14b. Flowers 1 cm. wide or less (2 5 dm. high; spring) 15. 



loa. Foliage glabrous or minutely pubescent; basal leaves cordate 

 Small-flowered Crowfoot, Ranunculus abortivus. 

 15b. Foliage villous; basal leaves barely cordate or not at all 



Small-flowered Crowfoot, Ranunculus micranthus. 



16a. Stem erect or essentially so 17. 



16b. Stem prostrate, creeping, or ascending. Early in spring 

 stems may be found which appear almost erect. Com- 

 mon spring-flowering buttercups are all classified here 22. 



