No. 17.] 



AGRICULTURAL COLLEGE. 



109 



Golden Ragwort. 



Bluebottle. 



Common Thistle. 

 Tall Thistle. 



Yellow Thistle. 

 Canada Thistle. 



Burdock. 



Dwarf Dandelion. 



Troximon. 



Long bearded 

 Hawk-Weed. 



Rattlesnake-Weed. 



White Lettuce. 



Dandelion. 



Senecio aureus, L. 



Ames ; Indianola ; Grinnell ; Charles City ; Burlington. 



Yar. Balsamitw. 



Burlington. 



Centaurea Oyanus, L. 



Ames — introduced lately from the east. 



Cirsium lanceolatum, Scop. 



Burlington. 



Cirsium altissimum, Spreng. 



Ames # ; Indianola ; Charles City. The common Thistle of our 

 fields and woodlands. 



Cirsium liorridulum, Miclix. 



Burlington. 



Cirsium arvense, Scop. 



Keokuk ; Ottumwa. 

 I found this outlawed plant growing in the streets of the city 

 of Keokuk in the autumn of 1870, and am informed on 

 good authority that about Ottumwa it is also found. The 

 strictest enforcement of our State law on this subject should 

 be demanded by every enterprising farmer and gardener. 



Lappa officinalis. Allioni, var. Major. 



Ames ; Burlington. A detestable weed. 



Krigia Virginica, Willd. 



Burlington. 



Troximon cuspidatum, Pursh. 



Ames ; Grinnell. 



Ilieracium longipilum, Torr.(?) 

 Ames. 



Ilieracium venosum, L. 



Grinnell ; Fayette. 



Nabalus albus, Hook. 



Ames ; Burlington. 



Xabalus asper, Ton. & Gray. 



Ames ; Grinnell. 



Nabalus crepidineus, DC. 



Ames. 



Taraxacum Dens-leonis, Desf. 



Ames; Indianola ; Charles City ; Fayette ; Burlington. 

 Probably introduced from the east at all these localities. 



