Plants with fibrous roots; acbenes glabrous 
Plants with rootstocks; acheneo pubescent. 
12. B. bracteata. 
Ach e ne s s mo o th . 
Aohenes 3 to 5 ran. long. 
Branches of the inflorescence hirsute. 13 
Branches of the inflorescence sc&berulous 
Disk subentire, the margin reflexed. _ . 
Disk 3-lobate, the Margin not reflexed. 
it. r s^ti ! ,i_os.o-c.iMela. 
Aohenes 2,5 ram. long or less. 
Aohenes white. .......... 16. jS. p T t r e_r ota . 
Aohenes chestnut or purple, . . . 17, S. 
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