(110) 



scarious margins. Beceptacle naked or villous. 

 Akenes obovate,with small epigjnous disc; pap- 

 pus 0. Heads small; flowers yellowish. 



1. A. PYCNOCEPHALA DO. Superflua: flowers 

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

 plant silky-villous ; leaves pinnately parted. — ZC • 

 Seashore. Summer. 



2. A. DRACUNCULOIDES Pursh. Superflua. 

 Flowers of the disc ^ , but sterile; their style 

 not bifid; plant glabrous; leaves linear. — 71. 

 Lake Chabot. Summer. 



3. A. Californica Less. Superflua. Flow-. 

 ers of the disc ^ , and fertile; their stjle 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. — U- Common. Summer. 



Tribe YII. Senecionid^. 

 Receptacle naked. Pappus capillary. 



56. Nardosmia t^ass. (Petasites,TonTU.) 



Monoecia, Necessaria. Heads dimorphous, 

 6 or ^ contains S flowers oc, ? flowers few. $ or 

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



