GENERA OR FAMILIES. 161 



f ff Pappus pilose, abundant. 

 J Involucral scales herbaceous. 

 Heads discoid or Jloscular. 



(150) Eupatorium heads few-flowered ; involucre imbricated, 



cylindrical or oblong, the scales oval- oblong ; receptacle 

 naked ; fruit angular or striated. 



Heads radiant. 



(151) Erigeron involucre imbricated oblong, the scales linear 



acute ; receptacle naked, foveolate ; pappus in many rows ; 

 fruit compressed. 



(152) Solidago involucre imbricated ; receptacle naked ; pappus 



in one row ; fruit terete. 



(153) Senecio involucre cylindrical or conical, of one row of 



equal scales, not membranous at the edge, with or with- 

 out smaller scales at the base ; receptacle naked ; fruit 

 cylindrical, with a pappus of simple soft hairs. 



(154) Inula involucre imbricated, in many rows ; receptacle 



naked ; pappus uniform, in one row ; anthers with two 

 bristles at the base. 



(155) Pulicaria involucre loosely imbricated in few rows ; re- 



ceptacle naked ; pappus in two rows, the outer cup-like, 

 membranous ; anthers with two bristles at the base. 



J Involucral scales dry, scarious. 



(150) G-naphalium involucre hemispherical, imbricated, the 

 scales unequal, blunt ; receptacle flat, naked. 



(157) Filago involucre subconical, imbricated, the scales equal, 



acuminate ; receptacle conical, scaly at the margin. 



** Florets all tubular; style swollen below its branches 

 (Cynarocephalse). 



t Involucral scales hooked at the point. 



(158) Arctium involucre globose, imbricated; receptacle flat, 



M 



