10. 
(65 ) 
Helenium.—Scales of the involucre re- 
flexed. Pappus of hyaline scales. Akenes 
turbinate, costate. 
Senecio.—Scales of the involucre 1-seri- 
ate, sometimes calyculate. Pappus ca- 
pillary, copious. 
Arnica.—Scales of involucre lanceolate, 
linear, all-equal. Pappus capillary, 1- 
serlate. 
b. Anthers calcarate. 
Pluchea.—Seales of involucre imbricate, 
herbaceous. 
Micropus.—Scales of involucre scarious, 
¢ flowers enclosed in marginal scales, 
which are laterally compressed and con- 
duplicate. Pappus 0. 
Stylocline.—Scales of involucre scarious. 
Receptacle cylindrical. @ flowers pro- 
tected by carinate scales. 
Filago.—Scales of involucre scarious. 
Scales subtending ¢ flowers not cari- 
nate. 
Anaphalis.——Scales of involucre scarious. 
2? flowers filiform. Style of & flowers 
nearly blunt. 
Gnaphalium.—Scales of involucre scari- 
ous.  flowersfiliform. Style of § flow- 
-ers 2-cleft. 
