40 VASCULAR PLANTS. 



66. Microseris, Don 



Involucre 2- seriate or imbricate. Receptacle 

 flat, naked. Akenes more than 5-costate, with 

 a callosity at the place of insertion; pappus 

 paleaceous, aristate, bristly, plumose, or some- 

 times wanting. Inflorescence in a scape. 



. % . flowers yellow. 



67. Stephanomeria, Nutt. 



Head few-flowered. Involucre 1 -seriate, ca- 

 lyculate. Receptacle flat, naked. Akenes 5- 

 costate, with a callosity at their place of inser- 

 tion; pappus 1-seriate, bristly, plumose, white, 

 coalescent. 



0. flowers pink, whitish. 



68. Rafinesquia, Nutt. 



Head oo-flowered. Involucre 1 - seriate, ea- 

 lyculate. Receptacle flat, naked. Akenes ros- 

 trate with a callosity at base; pappus white, 

 plumose, capillary, coalescent. 



. flowers white. 



60. HypDchaeris, L. 



Involucre imbricate. Receptacle paleaceous; 

 palese deciduous. Akenes rostrate; pappus 

 plumose. 



. if . flowers yellow. 



