156 
IOWA ACADEMY OF SCIENCES. 
Liatris scariosa Willd. 
L . pychnostachya Mx. 
Solidago missouriensis Nutt. 
►S’. speciosa var . angustata. 
►S’. rigida L. 
►S’. lanceolata L. 
Aster niultiflorus Ait. 
Aster tcevis L. 
Erigeron strigosus Muhl. 
Silphium laciniatum L. 
►S’, integrifolium Mx. 
►S', perfoliatum L. 
Ambrosia trifida L. 
A. art emi sice folia L. 
A. psilostachya DC. Less common than the two preceding 
species 
Xanthium canadense Mill. 
Heliopsis scabra Dunal. 
Echinacea angustifolia DC. 
Rudbeckia subtomentosa Pursh. 
Lepachys pinnata T. & G. 
Helianthus annuus L. 
H. grosse-serratus Marteus. 
Bidens frondosa L. 
Dysodia chrysanthemoides Lag. 
Chrysanthemum leucanthemum 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 L. 
Cnicus arvensis Ho film. Common only in isolated localities* 
but spreading. 
Taraxacum officinale Weber. 
Lactuca scariola L. Very abundant as a weed in gardens, as 
are also the two following species. 
L. canadensis L. 
Sonchus asper Vill. 
LOBELIACKjE. 
Lobelia spicata Lam. 
L . syphilitica L. 
OAMPANULACEjE 
Campanula americana L. 
PRIMULACE^E. 
Steironema ciliatum Raf. (Lysimachia ciliata.) 
OLEACEiE. 
Fraxinus americana L. 
F. rigidis Mx. 
