(65) 



8. Helenium. — Scales of the involucre re- 

 flexed. Pappus of hyaline scales. Akenes 

 turbinate, costate. 



9. Senecio. — Scales of the involucre 1-seri- 

 ate, sometimes calyculate. Pappus ca- 

 pillary, copious. 



10. Arnica. — Scales of involucre lanceolate, 

 linear, all equal. Pappus capillary, 1- 

 seriate. 



b. Anthers calcarate. 



1. Pluchea. — Scales of involucre imbricate, 

 herbaceous. 



2. Micropus. — Scales of involucre scarious, 

 9 flowers enclosed in marginal scales, 

 which are laterally compressed and con- 

 duplicate. Pappus 0. 



3. Stylocline. — Scales of involucre scarious. 

 Receptacle cylindrical. ? flowers pro- 

 tected by carinate scales. 



4. Filago.— Scales of involucre scarious. 

 Scales subtending ? flowers not cari- 

 nate. 



5. A naphalis. — Scales of involucre scarious. 



? flowers filiform. Style of ^ flowers 

 nearly blunt. 



6. Gnaphalium. — Scales of involucre scari- 

 ous. ? flowers filiform, j^ityle of flow- 

 ers 2-cleft. 



