VASCULAR PLANTS. 23 



shorter than the disk corolla, sometimes depau- 

 perate. 



0. small vernal herbs; flowers of the ray 

 yellow, white. 



b. Parts of the pap-pus go. 



4. Lessingia, Cham. 



iEqualis. Superflua. Bay flowers with pal- 

 mate limb. Receptacle flat, naked. Akenes 

 compressed, silky- villous; pappus 1 -seriate; 

 bristles go , scabrous, rigid. 



0. flowers purple, yellow. 



5. Chrysopsis, Nntt. 



Superflua. iEqualis. Head co-flowered; 

 ray flowers ligulate. Akenes compressed; 

 pappus 2-seriate, outer row short, paleaceous 

 scales; inner row, long, scabrous bristles. 

 71 . flowers yellow. 



c Aplopappus, Cass. 



Superflua. iEqualis. Head co-flowered. 

 Ray flowers ligulate. Bristles of the pappus go. 



71. £. rigid autumnal plants; flowers 

 yellow. 



7. Bigelovia, D. c. 



iEqualis. Superflua, by 1 ray flower. 

 Head few-flowered. Receptacle narrow. Pap- 

 pus 1-seriate; bristles cc. 



11. \> . autumnal plants; flowers yellow. 



