234 SYNGENESIA POLYGAMIA JEQ. Eupatorium. 



army of the plague. Root pungent, bitter, tonic ; the flowers 



close before rain ; retain this property for a long time. 



* * * Florets all tuhular, level generally ; flowers mostly with no ray^. 



BIDENS.' Bur-marigold. 



B. tripartita. Three-lobed B. Leaves in three seg- 

 ments. Bracteas unequal. Bristles of the seeds two 

 or three, erect. E. B. 1113. C. 4. 57. Eupato- 

 rium cannabinum foemina. G. E. 71 !• 



Watery places, sides oj" ditches arid ponds. 



An. Augiist. 



Stem two or three f. Ls. opposite, toothed, cut into one large 

 lobe with two or three smaller at its base. Fl. solitary, termi- 

 nating each branch, rather drooping, surrounded with several 

 simple, spreading, entire, rough-edged leaves. Cal.-scales 

 streaked with browm. Ls. upper simple, oval-spear-shaped. 

 Cal. leafy at the base. 

 Woollen and linen iiiay be dyed yellow with a decoction of this 



plant. The Cyprinus auratus, gold-fish, has been destroyed by the 



seeds adhering to the gills and jaws. 



B. cernua. Nodding B. Leaves spear-shaped, deeply 

 saw-toothed. Flowers drooping. Bracteas nearly- 

 equal, entire. Bristles of the seeds about four, erect. 

 E. B. 1114. C. 3. 55. 



Ditches, ponds. 



y. Bidens minima, i. e. smallest. Dry places lohere water has been, 

 and margins of ponds. A starved specimen of this plant found 

 on the north side of Shotover Hill. Sb. 



An. August. 



Stem less spreading than in Bid. tripartita. Ls. embracing the 

 stem, undivided, FL large, brighter yellow than in Bid. tripar- 

 tita. FL sometimes with large, radiant, strap-shaped female 

 florets, is the Coreopsis bidens oi Linn. 



EUPATO'RIUM.^ Hemp-agrimony. 



E. cannabinum. Common H. Leaves opposite, in 

 three, or five, deep, spear-shaped segments ; the middle 

 one longest. E. B. 428. E. cannabinum mas. G. 

 E. 711. 



Watery, boggy places. 



Per. July. 



Stems two or three f. or more, reddish, erect, branched, downy, 



' From the two teeth in the genus. 



2 From Eupator, King of Pontus. Plin, 



