156 lUWA ACADEMY OF SCIENCES. 



Liatris scariosa Willd. 



L. pychnostachya Mx. 



Solidago inissouriensis Nutt. 



5". speciosa var. angiistata. 



S. rig id a L. 



S. lanceolata L. 



Aster multiflorus Ait. 



Aster Icsvis L. 



Erigeron strigosus Muhl. 



Silphium laciniatuni L. 



.S. integrifolium Mx. 



S. perfoliatum L. 



Ambrosia trifida L. 



A. artemisicefolia L. 



A. psilostachya DC. Less common than the two preceding- 

 species 



Xantlnum canadense Mill. 



Heliopsis scabra Dunal. 



Echinacea angiistifolia DC. 



Rudbeckia subtomentosa Pursh. 



Lepachys pinnata T. & G. 



Helianthns annuus L. 



H. grosse-serratus Martens. 



Bidens frondosa L. 



Dysodia chrysanthemoides Lag. 



Chrysanthemum leiicanthemmn L. Abundant in pastures, in 

 scattered localities throughout the county. A very troublesome weed. 



Tanacetum yulgre L. 



Senecio aureus L. 



Cacalia tuberosa Nutt. 



Arctium lappa Ij. 



Oiicus arvensis Hoffm. Common only in isolated localities, 

 but spreading. 



Taraxacum officinale Weber. 



Lactuca scariola L. Very abundant as a weed in gardens, aa 

 are also the two following species. 



L. canadensis L. 



Sonchus asper ViH. 



LOBELIACK^. 



Lobelia spicata Lam. 

 L. syphilitica L. 



CAMPANULACE^ 



Campanula americana L. 



PRIMULACE.1E. 

 Steironema ciliatum Raf . (Lysimachia ciliata.) 



OLEACE^. 



Fraxinus americana L. 

 F. rigidis Mx. 



