78 45. COMPOSITE. 



angular, not -winged. Pappus 0, or a sligM membranous 

 border. 



tt Receptacle witbout scales. Heads discoidal. 



(18.) 19. Artemisia. F1. of disk perfect ; of tbe ray fem., 

 slender, in 1 row ; or aU berm. and tubular. Involucre 

 roundish. Pbyll. imbricate. Receptacle naked or bairy. 

 Fr. obovate, with a small epigyiious disk, without pappus. 



(19.) 20. Tanacetum. F1. as in Artemisia. Involucre he- 

 mispherical. Phyll. imbricate. Receptacle naked. Fr. 

 oblong, angular, with a large epigynous dish (as broad as the 

 fruit), crowned with a slight membranous border. 



ttt Receptacle scaly. Pappus scale-like. 



(20.) 24. Galinsoga. Heads radiant. Fl. of ray fem., li- 

 gulate, in one row ; of the disk perfect, tubular. Recep- 

 tacle conical. PhyU. 4 — 5, broad, ciliate, in one row. Fr. 

 prismatic, with a pappus of oblong scales. 



tttt Receptacle scaly throughout. Pappus 0, 



(21.) 15. Anthemis. Heads radiant. Fl. of the ray fem., 

 or neuter, ligulate, in 1 row ; of the disk perfect, tubular. 

 Receptacle convex or conical. Phyll. imbricate, of few 

 rows. Fr. terete, or bluntly tetragonal, without pappus, 

 but with a more or less prominent margin. 



[Anacyclus. Fr. compressed, winged at the edges. Other- 

 wise like Anthemis.'] 



(22.) 14. AcHiLLBA. Heads radiant. Fl. of the ray fem., 

 ligulate, short ; of the disk perfect, tubular ; tube plane- 

 compressed, 2-tvinged. Receptacle nearly flat, afterwards 

 often narrow and lengthened. luv. ovate or oblong. PhyU. 

 imbricate. jFV. compressed, without pappus. 



(23.) 18. DiOTis. Heads discoidal. Fl. all perfect, tubular ; 

 tube compressed, with 2 auricles at the base. Receptacle 

 convex, with concave downy-topped scales. Inv. beUshaped. 

 Phyll. imbricate. Fr. compressed, crowned with the per- 

 sistent auricled tube of the cor. ; pappus 0. 



0. Pappus of 2 — 5 stiff bristles. Receptacle scaly throughout. 



(24.) 23. BiDBNS. Heads discoidal, sometimes radiant. Fl. 

 ((jf the ray neuter, ligulate ;) of the disk herm., tubular. 

 Receptacle flat. Phyll, in 2 rows, outer row spreading. 



