WEED MIGRATION 755 



curred in Colorado in 1896. Gray reports it for Santa Barbara, 

 California, in 1880, and since then it has become fairly common in 

 that state. It was reported from several localities by Crandall and 

 Rydberg in Colorado in 1906; reported by Webber in Nebraska. 

 Mr. F. W. Paige states that this weed has been known in Ft. Dodge 

 since 1887. In 1906 it was spreading in Pottawattamie, Story, Sac, 

 Clay, and Kossuth counties, and has been reported from Westgate 

 (Bruce Fink), 1893; Boone (Geo. W. Carver and Pammel), 1895; 

 Des Moines, 1895; Corning, 1895 (Ellen Bettomer) ; well estab- 

 lished in Midway, 1896; Jordan, 1906 (Harriette Kellogg). 



Vegetable Oyster (Tragopogon pratensis L.). 



This was reported from Ames, in meadow, 1894; Iowa City, 



1889; Newton, 1889 (A. S. Hitchcock). 



Fetid Marigold (Dyssodia papposa (Vent.) Hitchc). 



Ackley, 1878 (B. E. Canavan) ; Boone, 1890; Keokuk, 1891 

 (P. H. Rolfs) ; Muscatine, 1891 (F. Reppert). This striking weed 

 has been known for some time at Ames, and was said by Hitchcock 

 to be frequent (Anth. Pteridophyta of Ames, p. 503). It is more 

 or less sporadic in its appearance, being frequent in some years, 

 in others not so common. It is, however, always abundant in 

 western Iowa, which leads me to believe that the plant is not in- 

 digenous to central Iowa, but introduced, although now occurring 

 in timber and along river banks. 



Ox-eye Daisy {Chrysanthemum leucanthemum L.). 



For a long period of years occasional specimens of this weed 

 have been found in the vicinity of the college, and it is an occa- 

 sional introduction in meadows, but except in one place some four 

 miles from Ames it shows no evidence of being naturalized. It has 

 also been reported from Muscatine (Reppert) ; Atlantic (S. O. 

 Hamill) ; Ames, 1871 (C. E. Bessey) ; Ackley, 1878 (B. E. Cana- 

 van) ; Sheldahl, 1885 (L. V. Harpel) ; Ames, 1891 (P. H. Rolfs) ; 

 still occurs between Ames and Gilbert, 1911, but is not spreading. 



Mr. J. H. Lees reports this plant as having been introduced into 

 the vicinity of Cedar Falls as early as 1890 and as occurring near 

 LeMars in 1912. 



