238 XLVL COMPOSITiE : CORYMBIFEE^. [Dioiis. 



the outer ones or bracteas often leafy. (Heads sometimes ivith 

 a neuter raxj^ — [N'ame : his^ double^ and dens^ a tooth ; from the 

 two awns or teeth which crown the fruit. 



1. B. cernua L. (jiodding J5.) ; flowers droopin^-, bracteas 

 lanceohite entire (longer than the involucre), leaves lanceolate 

 serrate undivided, bristles of the fruit about 3 erect. E, B 

 t. 1114. 



Sides of rivulets, ditches, and lakes, frequent. ©, 7 — 10. — Stem 

 1 — 2 ft. and more high, branched and slightly hispid. Leaves gla- 

 brous, deeply serrate. Flowers large, greenish-yellow. 



2. B. tripartita L. {trifid JB.) ; leaves tripartite, leaflets lan- 

 ceolate deeply serrate, bristles of the fruit 2 — 3. E, B. 

 t. 1113. 



25. Dioxrs Desf. Cotton-weed. (Tab. IV. C.) 



Pappus 0, Cor. with two ears at the base, which border the 

 germen and remain upon the fruit. Beceptade chaffy, its scales 

 fringed. /?zro?zicre imbricated, hemisphaji^ical. — JS^amed from 

 SiQ^ two^ and ovg^ ojtoc^ an ea?^^ from the ear-like appendages to 

 the fruit. 



' 1. D. maritivia Cass. (Sea-side C). Santollna i. : E. B. 

 t. 141. 



much used in medicine, and also in domestic economy. 



I; 



I 









, Marshy places, sides of ponds and lakes. ©. 7 — 9. . — Readily i , ;g c 



distinguished by its divided leaves. The flowers,' which are slightly f^en 



drooping, are smaller than those of B. cernua. Both species have 

 occasionally a ray of 3 toothed neuter florets. 



10 



0^ 



ii it^ 



i'h 



inToIoc 



i\ 



Ik 



Sandy sea-shores, principally on the east and south of England. 

 Jersey. 71. 8, 9. — Root running deep into the sand. Leaves ™7 



numerous, oblonn;, covered with a white dense tomentum, as are the (Jroopil 



scales of the involucre, which in a great measure conceal the small Slltj,!! 



yellow corollas. «- , 



26. Tanacetum Linn, Tansy. i uujj^'ijjj 



^ 



Achenes angled, crowned with a large epigynous disk and f'^*'!'^^' 



a membranous margin. Beceptade naked. Invohtere hemi- \ '"*"' 

 sphserical, imbricated. Ligulate florets sho;rt and trifid, or want- j *»i ^ 

 ing. — (Heads homodiromous .) — Name altered from Athanasia; 

 a, not^ and Bavaroc^ death ; or that which does not quickly fade. 



1. T. vulgare L, {common T.) ; leaves bipinnatifid inclso- Wej." 



serrate. E. B. t. 1229. 



Borders of fields and road-sides. %. 8. — Stem 1—3 ft. high. ^SlUes 



Flowers in a terminal corymb Whole plant bitter and aromatic, < UOOl 



Vsl 



at 



w 



