FLORA OF THE DISTRICT OF COLUMBIA. 275 



7. Eupatorium rotiindifolium L. 



Open low ground or in woods; Coastal Plain. July-Sept. Eastern U. S. 



8. Eupatorium serotinum Michx. 



Found only at Hickeys Ilill, Eastern Branch, Sept., 1899 (Steele). Eastern U. S, 



9. Eupatorium hyssopifolium L. 



Sandy fields; common, especially on the Coastal Plain. Aug.-Sept. Eastern U. S. 



10. Eupatorium torreyanum Short. 



Dry fields; frequent. Aug.-Sept. Pa. and southward. {E. hyssopifolium of 

 Ward'p Flora, in part.) 



11. Eupatorium altissimum L. 



Dry soil; Piedmont Region. Aug.-Sept. Eastern U. S. 



12. Eupatorium urticaefolium Reich. White snakeroot. 

 Deciduous woods; common. Aug.,-Sept. Eastern N. Amer. (E. ageratoides L. i.) 



13. Eupatorium aroma ticum L. 



Woods; common. Sept. Eastern U. S. 



One specimen from our region has leaves in whorls of 3 . 



14. Eupatorium coelestinum L. ' Mist-flower. 

 Low woods or fields; common. July-Oct. Eastern U. S., north to N. J. {Cono- 



clinium voehstinum DC.) 



4. MIKANIA Willd. 



1. Mikania scandens (L.) Willd. Climbing hempweed. 



Swamps or wet ground. Aug.-Sept. Eastern N. Amer. to tropical S. Amer. 

 (Willvghbaea scandens Kuntze.) 



Readily distinguished from all our other Asteraceae by its climbing stems; flowers 

 fiesh-colored . 



5. KUHNIA L. 

 1. Kuhnia eupatorioides L. False boneset. 



Woods. Sept .-Oct. Eastern U. S. 



6. LACINARIA Hill. Blazing star. 



Bracts very acute, stiff, with thick firm margins 1. L. squarrosa. 



Bracts obtuse or rounded at the apex, with thin scarious margins. 

 Heads 1 cm. broad or narrower, often numerous; bracts erect and appressed; leaves 



linear 7 mm. wide or less 2. L. graminifolia. 



Heads 1.5-2 cm. broad, few; outer bracts refiexed; leaves lance-oblong, mostly 

 1.5-4 cm. wide 3. L. scariosa. 



1. Lacinaria squarrosa (L.) Hill. 



Dry fields near Alexandria, Accotink, and Cropley. July-Aug. Pa. and south- 

 ward. {Liatris squarrosa Willd.) 



2. Lacinaria graminifolia (Walt.) Kuntze. 



Dry fields and open woods of the Coastal Plain; common. Sept.-Oct. South- 

 eastern U. S.. north to Md. {Liatris graviinifolia Pursh.) 



3. Lacinaria scariosa (L.) Hill. 



Hillsides and bluffs of the Piedmont Ilegion, Virginia side of the Potomac. Sept.- 

 Oct. Eastern U. S. {Liatris scariosa Willd.) 



7. GRINDELIA Willd. 



1. Grindelia squarrosa (Pursh) Dunal. Gum-plant. 



Near the mouth of Hunting Creek, August, 1916 {Miss F. W. Layton). Native of 

 the western U. S. 



Characterized by the very "gummy" heads of yellow flowers. 



