FLORA OF THE DISTRICT OF COLUMBIA. 281 



6. Aster sagittifolius Willd. 



"Woods along the Potomac from Georgeto^Ti westward. Sept.-Oct. Eastern N. 

 Amer. 



6. Aster imdulatas 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 U. S. 



A. patens phlogifolius Nees (A. phlogifoUus Muhl.) is a form mth 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 astek. 

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



disft-ibuted in the U. S. and Can. 



9. Aster oblongifolius 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 potomncensis Burgess.) 



13. Aster concinnus Willd. 



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



Our material perhaps not essentially different from the preceding species. 



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. Aracr. {A. 



diffusus Ait.; -4. 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. 



