ASTERACEAE: ASTEREAE 171 



Heads radiate. 



Leaves spinulose-dentate. 5. Sideranthus. 



Leaves entire or toothed, not spiuplose-dentate. 



Stem low, woody, leaves evergreen. 6. Stenotus. 



Stem entirely herbaceous, leaves not evergreen. 



Rays not more numerous than the diskflowers, leaves 

 mostly lanceolate, rarely linear-lanceolate. 



7. Solidago. 

 Rays more numerous than the diskflowers, leaves linear- 

 lanceolate. 8. Euthamia. 

 Ray flowers blue, pink, purple or white, never yellow. 



Pappus a mere crown of a few scales or awn-like bristles. 



Plants low, not even 2 dm. high. 9. Townsendia. 



Plants tall, erect, 6 dm. or more high. 10. Boltonia. 



Pappus of numerous capillary bristles. 



Rays, slightly, if at all exceeding the pappus. 



Heads 8-12 mm. broad, bracts in 2-3 series. 13. Brachyactis. 



Heads about 4 mm. broad, bracts in 1-2 series. 16. Leptilon. 



Rays conspicuous, longer than the pappus, usually equaling or 

 exceeding the diameter of the disk. 

 Bracts in several series, the outer shorter, usually well imbri- 

 cated. 

 Disk-flowers yellow turning red, brown or purple. 



Leaves entire or serrate, the teeth not bristle tipped. 



11. Aster. 

 Leaves lobed or incised-dentate, the lobes bristle tipped. 



14. Machaeranthera. 

 Disk-flowers permanently white. 12. Leucelene. 



Bracts in 1-2 series, little imbricated, rays numerous 20-150. 



15. Erigeron. 



' 1. Gutierrezia. 927. 



1. Guterrezia sarothrae (Pursh.) Britton & Rusby. 



In dry or rocky soil in the western part of the state. Banner County; 

 Belmont; Callaway; Deuel County; Ft. Niobrara; Hat Creek Basin; 

 Pine Ridge; Scotts Bluff County; Valentine. 



2. Grindenia. 928. 



1. Grindelia squamosa (Pursh.) Dunal. Gum-weed. 



In dry soil over most of the state. Ainsworth; Callaway; Lincoln; 

 Nebraska City; Minden; Scotts Bluff County; Thedford; Rushville; 

 Wahoo. 



3. Chrysopsis. 929. 



Leaves appressed canescent, plants 3-6 dm. high. 1. C. villosa. 



Leaves hispid or hirsute with a spreading pubescence, plants rarely 

 over 3 dm. high. 

 Leaves copiously hairy, only slightly viscid. 



Leaves mostly subsessile, heads peduncled, stems 2-3 dm. high. 



3. C. horrida. 



