234 UNIVERSITY OF MISSOURI STUDIES [382 



1053. A. crassulus Rydb. Thickish aster. 



Sunset Canon; common on the plains, 5100-80GO ft. (Dan- 

 iels, 720). 



North Dakota to Idaho; Colorado to California. (?) 



1054. A. polycephalus Rydb. Many-headed aster. 

 Common on the plains and foothills, 5100-7000 ft. (Dan- 

 iels, 1000). 



Alberta to Nebraska ; Texas to Arizona. 



1055. A. commutatus Gray [A. incanopilosus (Lindl.) Shel- 

 • don]. White prairie aster. 



Common on the plains and foothills, 5100-7000 ft. (Dan- 

 iels, 717). 



Minnesota to Wyoming; Kansas to Nevada. 



1056. A. laevis L. Smooth aster. 



Caiions and wooded slopes on the foothills, 5800-8000 ft. 

 (Daniels, 685). 

 Ontario to Saskatchewan ; Louisiana to New Mexico. 



1057. A. Porteri Gray. Porter's aster. 



Abundant throughout, 5100-10000 ft. (Daniels, 697). Also 

 mountains between Sunshine and Ward (Rydberg). Very va- 

 riable; an extreme form, only i-i^dm., high, was col- 

 lected on bare ridges at Glacier lake. 



Colorado. 



1058. A laetevirens Greene. Light-green-leaved aster. 

 Canons at Eldora, 8600-8700 ft. (Daniels, 858). 

 Colorado and Wyoming. 



1059. A. coerulescens DC. [A. salicifolius coerulescens (DC.) 

 Gray]. Caerulean aster. 



Swales in the plains, 5100-6000 ft. (Daniels, 995). 

 Wyoming to Texas. 



1060. A. Osterhoutii Rydb. Osterhout's aster. 



About lakes and swales and along ditches in the plains, 

 5100-6000 ft. (Daniels, 779). 

 Colorado. 



