45. COMPOSITE. 197 



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 Anthems.] 



(22.) 14. ACHILLEA. Heads radiant. Fl. of the ray fern., 

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

 compressed, 2-winyed. Receptacle nearly flat, afterwards 

 often narrow and lengthened. Inv. ovate or oblong. Phyll. 

 imbricate. Fr. compressed, without pappus. 



(28.) 18. DIOTIS. Heads discoidal. Fl. all perfect, tubular ; 

 tube compressed, with 2 auricles at the base. Receptacle 

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

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

 sistent auricled tube of the cor. ; pappus 0. 



C. Pappus of '2 5 stiff bristles. Receptacle scaly throughout. 



(24.) 23. BIDENS. Heads discoidal, sometimes radiant. FL 

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

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

 Branches of the style surmounted by short cones. Fr. 

 compressed, angular, rough at the edges ; the angles ending 

 in 2 5 hispid bristles. 



Suborder II. CYNAROCEPHALE.E. 



Flowers all tubular. Style usually thickish below its branches, 

 which often combine into a more or less perfect cylinder. In- 

 volucre imbricate. 



a. Basal scar of fr. transverse, rounded. Anthers tailed. 



25. SAUSSUREA. Fl. all perfect. Phyll. unarmed. Recep- 

 tacle scaly. Pappus in two rows, outer of short rough 

 bristles, inner feathery. 



26. CARLINA. Fl. all perfect. Outer phyll. lax, leaflike spi- 

 nous, inner linear, membranous, coloured and resembling 

 a ray. Receptacle with cleft scales. Pappus in one row 

 branched and feathery, united in a ring below. 



27. ARCTIUM. Involucre globose. Phyll. ending in hooked 

 points. Receptacle flat, with rigid subulate scales. Fr. 

 compressed, oblong. Pappus short, hairlike, distinct. 



