392 Astereae 



2. C. Nevinii (Gray) Kuntze. Herbage white-woolly ; leaves 

 repandodentate ; heads 30-40-flowered ; otherwise as in the last. 

 Newhall, Nevin. 



Tribe 2. ASTEREAE. ASTER TRIBE. 



Annual or perennial herbs or rarely shrubs, with usu- 

 ally scentless herbage and alternate leaves. Receptacle 

 naked. Bracts of the involucre commonly well-imbri- 

 cated. Disk-flowers commonly yellow. Rays present or 

 wanting. Anthers not caudate. Pappus of bristles or 

 aw r ns. Pollen grains echinate. 



Pappus of several caducous awns; heads large. 3. GRINDELIA. 



Pappus of several short scales; heads small. 4. GUTIERREZIA. 



Pappus of a few persistent slender bristles. 5. PENTACHAETA. 



Pappus of many persistent slender bristles. 

 Rays present, yellow. 



Rays without pappus. 6. HETEROTHECA. 



Rays with pappus like that of disk-flowers. 



Pappus of 2 kinds, the outer short and scale-like. 



7. CHRYSOPSIS. 

 Pappus of 1 kind only. 



Perennial glabrous or pubescent herbs. 



Heads small, in scorpioid racemes. 8. SOLIDAGO. 



Heads small in corymbose panicles. 9. EDTHAMIA. 



Evergreen woody plants with punctate, flat or terete leaves. 



10. CHRYSOMA 

 Rays present, not yellow. 



Pappus rusty-brown; anthers with slender appendages at apex. 



14. CORETHROGYNE. 



Pappus dull white. 



Bracts in more than 2 series. 15. ASTER. 



Bracts in 1-2 series. 



Rays exceeding the disk. 16. ERIGERON. 



Rays inconspicuous, shorter than the disk. 17. LEPTILON. 

 Rays none. 



Outer flowers enlarged and more deeply cleft on the inner side. 



13. LESSINGIA. 

 Outer flowers not enlarged. 

 Flowers yellow. 



Herbage glandular and glutinous. 12. HAZARDIA. 



Herbage pubescent. 11. ISOCOMA. 



Flowers not yellow. 



Outer flowers pistillate, truncate; inner hermaphrodite. 



18. CONYZA. 

 Dioecious shrubs or perennial herbs. 19. BACCHARIS. 



