6o 



RANUNCULACEAE (CROWFOOT FAMILY) 



ical leaves appearing pinnate, the long-stalked terminal division being 

 remote from the sessile lateral ones. Petals often 6 or 7 and twice 

 the length of the calyx. The carpels scarcely margined, beaked. 

 The style long and attenuate. Petals bright yellow. Dry or moist 

 hills.. April and May. 



R. septentrionalis, Common Swamp Buttercup, The style long 

 and attenuate. Petals bright yellow. The stems 3-8 dm. long, erect, 

 ascending, or in wet ground some of them procumbent. The lower 

 petioles very long, and the leaves 3-divided. The petals, broadly 

 obovate, much larger than the calyx. The carpels strongly margined 

 and beaked. Moist or shady places. May-August. 



R. bulbosus. Hairy. Stem 3 dm. high, erect from a, bulb-like 

 base. The root-leaves 3-divided, the lateral divisions being sessile, the 

 terminal ones stalked and 3-parted. Petals round and wedge-shaped 



at base. Calyx reflexed. Carpels with a 

 very short beak. Fields. Abundant' in 

 the N. E. and rare west. May-July. The 

 petals often 6 or 7, deep glossy yellow, 

 the corolla more than 2.5 cm. broad. From 

 Europe. 



R. acris, Hairy. Stem erect, 6-9 dm. 



high. Leaves 3-divided, the divisions all 

 sessile and 3-cleft or parted. The petals 

 obovate, much longer than the calyx. 

 Flowers nearly as' large as the preceding 

 species, but not so deeply yellow. Com- 

 mon in fields, especially in the east. June- 

 August. From Europe. 



THALICTRUM 



Thalictrum di o i c um , Early 

 meadow rue. a, pistillate in- 

 florescence; h, staminate in- 

 florescence; c, leaf; d, single 

 flower. 



Perennial herbs, with alternate com- 

 pound leaves, the divisions and the 

 leaflets stalked, and the petioles dilated 

 at the base. Flowers in corymbs, 

 usually dioecious. Sepals 4—5, petal- 

 like or greenish and usually disappearing. Petals none. Achenes 

 4-1 5- 



T. dioicum, Early Meadow, Rue. Dioecious. Smooth and pale or 

 glaucous, 3-6 dm. high. The leaflets thin, light green, drooping,. 3-7 



