FLORA OF THE DISTRICT OF COLUMBIA. 275 



7. Eupatorium rotuadifolium L. 



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



8. Eupatorium serotinum Michx. 



Found only at Hicke/s Hill, 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's 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. arieratoidesL. f.) 



13. Eupatorium aromaticum L. 



Woods; common. Sept. Eastern IT. 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 coelestinum DC.) 



4. MIKANIA Willd. 



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



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

 (Willughbaea scandens Kuntze.) 



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

 flesh-colored . 



5. KTTHNIA L. 

 1. Kuhnia eupatorioides L. False boneset. 



Woods. Sept -Oct. Eastern IT. 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 reflexed; leaves lance-oblong, mostly 

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



1. Laciuaria 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 IT. S., north to Md. (Liatris graminifolia Pursh.) 



3. Lacinaria scariosa (L.) Hill. 



Hillsides and bluffs of the Piedmont Region, 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. 



