1 1 1 II 



III 



IV 



V 



VI 



VII 



VIII 





Solidago canadensis L. 



P 







4 















Solidago Riddellii Prank 



n 













4 









Solidago serotina gigantea (Ait.) 























Gray 



P 







4 















Boltonia asteroides (L.) L 'Her, 



n 







3 







1 









Aster punieeus lucidulus Gray 



n 







5 















Aster umbellatus Mill. 



0 







4 







4 









Erigeron philadelphicus L. 



P 





• 



4 















Eclipta alba (L.) Hassk. 



n 







4 















Silphium perfoliatum L. 



n 













4 









Ambrosia trifida L. 



n 













o 



o 







Rudbeckia laciniata L. 



P 







4 















Helianthiis grosserratus Mart, 



n 













o 



3 







Bidens Beckii Torr. 



m 



3 









4 











Bidens cernua L. 



n 







3 















Bidens frondosa L. 



n 







4 















Bidens vulgata puberula (Wieg.) 























Greene 



n 







3 









3 



3 





Helenium autumnale L. 



n 







4 







4 









Artemisia biennis Willd. 



n 







4 







4 









Seneeio aureus L. 



n 















5 







Senecio palustris (L.) Hook. 



n 







5 















C?irsium muticum Michx. 



n 







5 















Prenanthes racemosa Michx. 



n 













4 









In addition to their more characteristic flora the border swamps also 

 sometimes contain plants belonging ordinarily to other habitats. In such 

 cases the plants appear in small numbers, and not infrequently on hum- 

 mocks which oifer limited but fairly well drained stations for their growth. 

 The following species were collected by the writer in such places: 



Prairie plants 



Oxalis stricta 

 Pycanthemum flexuosum 

 Pycanthemum virginianum 

 Sporobolus heterolepis 

 Thalictrum dasycarpum 

 Thaspium aureum 

 Zizia aurea 



Allium canadense 

 Ambrosia psilostachya 

 Aster laevis 

 Elymus virginicus 

 Erigeron philadelphicus 

 Hordeum jubatum 

 Lespedeza leptostachya 

 Panicum capillare 



Agrimonia striata 

 Chenopodium hybridum 



Chenopodium album 

 Chenopodium urbicum 



Forest plants 



Ribes floridum 

 Stellaria longifolia 



Introduced weeds 



Polygonum aviculare 



49 



