FLORA OF THE DISTRICT OF COLUMBIA. 281 



5. Aster sagittifolius Willd. 



Woods along the Potomac from Georgetown westward. Sept.-Oct. Eastern N. 

 Amer. 



6. Astet undulatus L. 



Dry or moist woods, thickets, or hillsides; common. Sept.-Oct. Eastern N. 

 Amer. 



A variable species of which numerous segregates have been proposed, based chiefly 

 on the form of leaves and inflorescence. It seems better, however, to treat these slight 

 variations as forms of one readily recognizable species. 



7. Aster patens Ait. 



Dry woods or thickets or open fields; common. Sept.-Oct. Eastern IT. S. 



A. patens phlogifolius Nees (A. phlogifolius Muhl.) is a form with thinner, often 

 larger, less rough leaves than the species. It does not seem to differ essentially, at least 

 in our range, although it has often been recognized as a distinct species. 



8. Aster novae-angliae L. New England aster. 

 Moist thickets and fields along the upper Potomac ; infrequent. Sept.-Oct. Widely 



distributed in the U. S. and Can. 



9. Aster oblongiiolius Nutt. 



On rocks and exposed slopes along the upper Potomac. Sept.-Oct. Pa. to Minn, 

 and southward. 



10. Aster puniceus L. Red-stalked aster. 

 Swamps and low ground; frequent. Sept.-Oct. Eastern N. Amer. 



11. Aster prenanthoides Muhl. 



Ravines or moist woods along the upper Potomac; Hunting Creek; infrequent. 

 Sept.-Oct. Eastern U. S., south to Va. 



12. Aster laevis L. Smooth aster. 

 In woods; northward and eastward; rare. Sept. Widely distributed in the U. S. 



(A laevis potomacensis Burgess.) 



13. Aster concinnus Willd. 



Woodley Park, in 1878 (Ward). Eastern U. S. 



Our material perhaps not essentially different from the preceding specieB. 



14. Aster novi-belgii L. 



Swamps or low ground, eastward. Sept.-Oct. Eastern N. Amer. (A. aestivus of 

 Ward's Flora.) 



15. Aster concolor L. Silver aster. 

 Dry soil, northeastward; also near Barcroft; infrequent. Sept.-Oct. Eastern 



U.S. 



16. Aster radula Ait. 



Powdermill Bogs and near Suitland. Aug -Sept. Eastern N. Amer., south to 



Md. 



17. Aster lateriflorus (L.) Britton. Calico aster. 

 Dry or moist fields and thickets; common. Sept.-Oct. Eastern N. Amer. (A. 



difusus Ait.; A. miser Nutt.; A. hirsuticaulis Lindl.) 



Variable in pubescence and form of inflorescence. The most copiously pubescent 

 form is A. lateriflorus hirsuticaulis (Lindl.) Porter. 



18. Aster vimineus Lam. 



Moist soil; frequent, Sept.-Oct. Eastern N. Amer. (A. tradescanti of Ward's 

 Flora, in part.) 



19. Aster dumosus L. 



Fields or open woods; northward and eastward. Aug.-Oct. Eastern N. Amer. 



