IOWA ACADEMY OP SCIENCES. 
Ill 
seem to me proper to make a record of all such plants in a card 
catalogue where the specimens cannot be preserved. 
It is an interesting fact to -note that it frequently takes 
years for a weed to become so well established as to attract 
attention. Some years ago Dr. Halsted, while connected with 
the Iowa Agricultural college, noted that Solarium rostratum 
had been reported to him. This plant has long occurred in 
western Iowa but it is only recently that it has been reported from 
many parts of the state, showing increased tendency to spread. 
It is no longer considered worth while by the average farmer 
to report Lactuca scariola^ it is so thoroughly naturalized, and 
yet some few years ago it was seldom seen. It has undoubtedly 
become thoroughly acclimated over a large extent of our terri- 
tory, occurring not only in streets and timbers of our own 
state but in the heart of the Rocky mountains far away from 
any habitation. 
In the appended list the species are arranged according 
to Gray’s Manual, sixth edition, also adopting the nomencla- 
ture of that work. 
RANUNCULACE^. 
Ranunculus acris'Li. College campus in Ames. It is scarcely 
persistent. 
DelpMnum consolida L. Corning, 1895 (Ellen Bettonier.) 
PAPAVERACE^. 
Argemone alba L. Southern Iowa near Ottumwa. 
CRUCIFERS. 
Camelina saliva Crantz. Ames, 1891 (Hitchcock). Hazleton 
(Koight.) 
Brassica alba Boiss. Ames. Corbett in Hitchcock. (Antho- 
phytaand Pteridophy ta of Ames, 1891, p. 486) 1896. Dooryards 
north of agricultural building, I. A. C. campus. Geo. Carver, 
1896. 
Erysimum asperum D. C. Ames, 1896, along railroads 
undoubtedly from the west (G. W. Carver.) 
Sisymbrium altissimum L. Ames, 1895, G. W. Carver. 
To this should be added the localities given by L. H. Dewey, 
Davenport, Blue Grass, Dickqns. (Circular No. 7, Division of 
Bot. U. S. Dept, of Agr. 
