64 THE BIOLOGY OF HARDING COUNTY 



430 Heiianthus annuus L. Large Sunflower. 



About dwellings and fields, especially in the valleys. 

 [Heiianthus hirsutus Raf. 

 Reported by Fromme.] 



431 Heiianthus Ma.rimilianus Schrad. Prairie Sunflower. 

 Scattered all over the plains ; most frequent on hillsides. 



432 Heiianthus petiolaris Nutt. Prairie Sunflower. 

 On sandy floodplains, locally very numerous. 



433 Heiianthus scaberrhnus Ell. Stiff Sunflower. 

 On grassy tables of forest reserves, not common 



434 Iva xanthifolia Nutt. 



Widely distributed about buildings, animal burrows, also in 

 shaded valleys. 

 *435 Madia glomerata Hook. Tarweed. 



Abundant on the foothills of East Short Pines. 



436 Ratibida columnaris (Sims.) D. Don. Cone-flower. 

 Found to be numerous on all grassy areas. 



437 Xanthium echinatinn Murr. Cocklebur. 

 Quite abundant on mud flats along rivers. 



COMPOSITAE, tribe Helenieae 



438 Actinclla simplex A. Nels. 



Abundant everywhere in the open ; p 1 ains, buttes and bad- 

 lands. 



439 Bakia oppositifolia Nutt. 



Common in grassy tables of buttes, frequent on steppe espe- 

 cially along roads. 

 *44O Chaenactis Douglasii H. & G. 

 Rare, Short Pine Hills. 

 [Gaillardia pinnatifida Torr. 

 Reported by Fromme.] 



441 Hymeno pappus filifolius Hook. 

 Not rare on rocks. 



COMPOSITAE, tribe Anthemideae 



442 Achillea niillefoliuin L. Yarrow, Milfoil. 

 Abundant in grassy areas especially on hillsides. 



*443 Artemisia arowiatica A. Nels. Fragrant Wormwood. 



Abundant everywhere on the plains, much parasetized by 

 Orobanchia. 



