Explanation of PL V. 



Eupatorium gracillimum HAY ATA. 



Fig. 1. A branch. 



2. A head. 



3. A flower. 



4. Corolla. 



5. An apical portion of the same corolla. 



6. Stamens. 



7. A style with the basal stylopoclium. 



8. A achenc. 



9. A pappus-hair. 



