THE LIBRARY OF THE 

 JUL241943 



UNIVERSITY OF 



PLATE X. 

 X. oviforme Walk 1 . 



F. I. Suksdorf (Hb. Field 211249, cotype of X. silphiifolium Greene). 

 F. 2 and 3. Suksdorf 189 (Hb. Gray, topotype of X. silphiifolium Greene). 

 X. speciosum Kearn. 



F. 4 and 6. Bush 1185 (Hb. Mo. 85380, type material of X. bubalocarpon 



Bush). 



F. 5. Kearney 785 (Hb. N. Y.; cotype). 

 X. campestre Greene. 



F. 7. Greene (Hb. Greene 19837, type; an atypic bur on lower part of plant; 



burs higher up on type are more as in f. 8). 

 F. 8. Heller 11629 (Hb. Gray, topotype). 



