108 



MISSOURI BOTANICAL GAKDKN. 



7.5 cm. long, the upper shorter, irregularly cleft or herni- 

 ate; heads few to many, in a simple or compound corymb, 

 the long-acuminate bracts 6 to 7 mm. long; heads 8 to 

 12 mm. high, 10 to 14 mm, broad (without the rays) ; rays 

 conspicuous, 8 to 12, toothed at the apex, 5 to 6 mm. long ; 

 achenes glabrous. — Low prairies, Illinois, Iowa and Mis- 



souri to Kansas and Texas. Sp 



Se 



with its cordate-ovate to reniform 



basal leaves which are very deeply cordate at base, is very 

 readily distinguished from this species. 



M 



8 



of 



the Rocky Mountain region, but consistently has much less 

 sharply serrate and more oblong lower leaves, much less 



pinnatifid upper leaves, and 

 shorter rays. 



% 



and 



Spc 



examined. — Missouri : Levasy, Jackson 

 Bush 1678, May 18, 1902, type; Independence, 

 ie, May 4, 1896 ; Adam's Station, Jackson County, 

 fe, May 23, 1897; Sheffield, Mackenzie, June 4, 



1899. Illinois: West Chic 

 Iowa: Johnson County, F\ 

 sas : Bourbon County, Hitci 



Umbach 



May, 1896. K 



B 



1898. 



'chcock, May 5, 1897. Texas: 

 10, 1898; San Marcos, Stanfield, 



