(67) 



9. Lagopiiylla. — Kay flowers 5 in number, 

 cuneiform, 3-lobecl. Involucre 5 scales, 

 each entirely embracing a ray akene. 

 Receptacle flat. 



10. Layia. — Capitulum cc-flowered. Invo- 

 lucre 1-seriate. Scales acumiuate, each 

 entirely enclosing a ray akene. Pappus 

 of the ray 0. 



11. Achyrachtena. — Eay flowers short and 

 hidden by the scales of the 1-seriate 

 involucre. Receptacle naked in the 

 centre, paleaceous toward the margin. 

 Pappus paleaceous. Palea3 co-seriate, 

 silvery. 



bb. Involucre imbricate. 



1. Achillea. — Involucre of few series of 

 scales. Rays short, oval. 



2. Anthemis. — Involucre oo - seriate. Rays 

 long, ligulate. 



b. Anthers calcarate. 



1. Psilocarphus. — Scales of the involucre 

 few. ? flowers each wrapped in a palea. 

 Pappus 0. 



2. Stylocline. — Scales of the involucre few. 



? flowers each bracteate by a carinatc 

 palea, but not wrapped in it. Pappus a 

 few caducous bristles. 



