400 SYNGENESIA— POLYGAMIA-^QU. Bidens. 



/3. With radiant, three-toothed, marginal florets, ^ 



Conyza palustris, foliis trii)artit6 divisis. Loes. Pruss.53. t. 10. 



Trifid Bur Marygold. Petiv. H. Brit. t. 20./. 7. 



In watery places, and about the sides of ditches and ponds, fre- 

 quent. 



Annual, August, September. 



Root tapering, with many fibres. Sjem 2 or 3 feet high, erect, an- 

 gular, solid, smooth, leafy, with opposite axillary branches. 

 Leaves opposite, on winged footstalks, dark green, smooth, 

 strongly serrated, acute, in 3 deep segments, sometimes 5 ; the 

 uppermost or lowermost generally undivided. Fl. terminal, so- 

 litary, of a brownish yellow, somewhat drooping, devoid of 

 beauty and of fragrance, each surrounded by about 8 spreading, 

 lanceolate, serrated or entire bracteas, unequal in size, but all 

 extending much beyond the flower. Seeds with 2 or 3 prickly 

 angles, and as many erect bristles, likewise prickly with reflexed 

 hooks, by which the seeds stick like burs to any rough surface, 

 and are said sometimes to injure fish, by getting into their gills. 



The herb gives a yellow colour to woollen or linen. 



2. B. cernua. Nodding Bur-marigold. 



Leaves lanceolate, serrated. Flowers drooping. Bracteas 

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

 erect. 



B. cernua. Linn. Sp. PL 1 165. mild. y. 3. 1 716. Fl. Br. 858. 

 Engl. Bot. V. J 6. <. i 1 14, Curt. Lond.fasc. 3. t. 55. Hook. Scot. 

 238. Fl. Dan. t. 841. 



B. n. 120. Hall. Hist. V. 1.50. 



Verbesina pulchriore flore luteo. Raii Syn. 1 87. Bauh. Hist. v. 2. 

 1074./. 



Hydropiper aliud. Dalech. Hist. 1040./, 



/3. With radiant, three-toothed, marginal florets. 



Coreopsis Bidens. Linn. Sp. PL 1281 . 



Chrysanthemum cannabinum bidens, foliis integris oblongis. 'Mo- 

 ris, v. 3. \7.sect.6. t.5.f.22. 



Conyza palustris, foliis serratis, Loes. Prnss. 54, t.W. 



Eupatorium cannabinum chrysanthemum. Barrel. Ic. t. 1209. 



y. Bidens minima. Linn. Sp.Pl.WQb. Huds.ed. \.S 10. Abbot 

 178. FLDan.t.3\2. 



B. tripartita /3. Huds. ed. 2. 355. 



Verbesina minima. Dill, in Rati Syn. 188. i. 7./ 2. Giss. 167. ap- 

 pend. 66. 



Eupatorium cannabinum palmare et angustifolium. Merr. Pin. 37. 



In ditches and ponds. 



/3. Frequent in Ireland, and not rare in England, Sherard. Che- 

 shire. Huds. Norfolk, but not common. Mr. Woodward. In 

 Thorpe meadows, Norwich. 



