(110) 



scarious margins. Receptacle naked orvillous. 

 Akenes obovate,with small epigynous disc; pap- 

 pus 0. Heads small; flowers yellowish. 



1. A. PYCNOCEPHALA DC. Superflua: flowers 

 of the disc , but sterile; their style not bifid ; 

 plant silky-villous ; leaves pinnately parted. 2 . 

 Seashore. Summer. 



2. A. DBACUNCULOIDES Pursh. Superflua. 

 Flowers of the disc , but sterile; their style 

 not bifid; plant glabrous; leaves linear. 1. 

 Lake Chabot. Summer. 



3. A. CALIFORNIA Less. Superflua. Flow- 

 ers of the disc , and fertile; their style bifid; 

 frutescent, paniculately branched, canescent; 

 leaves pinnately parted; lobes filiform. *? . 

 Common. Summer. 



Branches and leaves insecticide of con- 

 siderable power. 



4. A. LUDOVICIANA Nutt. Style of the flow- 

 ers of the disc bifid; involucre tomentose; 

 leaves lanceolate; the lower frequently parted 

 into 3-5 lobes. 1. Common. Summer. 



Tribe VII. SENECIONID^}. 

 Receptacle naked. Pappus capillary. 



56. NardoSHlia Cass. (Petasites, Tourn.) 



Monoecia, Necessaria. Heads dimorphous, 

 3 or g contains $ flowers oc, ? flowers few. $ or 

 $ head contains Q or 6 flowers few, ? flowers oo. 



