11. 
(67 ) 
Lagophylla.—Ray flowers 5 in number, 
cuneiform, 3-lobed. Involucre 5 scales, 
each entirely embracing a ray akene. 
Receptacle flat. 
Layia.—Capitulum o-flowered. Invo- 
lucre 1-seriate. Scales acuminate, each 
entirely enclosing a ray akene. Pappus 
of the ray 0. 
Achyrachena.—Ray flowers short and 
hidden by the scales of the 1-seriate 
involucre. Receptacle naked in the 
centre, paleaceous toward the margin. 
Pappus paleaceous. Palew o-seriate, 
silvery. 
bb. Lnvolucre imbricate. 
Achillea.—Involucre of few series of 
scales. Rays short, oval. 
Anthemis.—Involucre o-seriate. Rays 
long, ligulate. 
b. Anthers calcarate. 
Psilocarphus.—Scales of the involucre 
few. flowers each wrapped in a palea. 
Pappus 0. 
Stylocline.—Scales of the involucre few. 
? flowers each bracteate by a carinate 
palea, but not wrapped in it. “Pappusa 
few caducous bristles. 
