WEEDS OP IOWA, MINNESOTA AND WISCONSIN 
57 
A COMPARATIVE STUDY OF THE WEEDS OF CENTRAL 
IOWA, NORTHERN MINNESOTA AND WISCONSIN. 
L. H. PAMMEL. 
During a short trip made by the writer in northern Minne- 
sota from Cass Lake to Duluth in Minnesota, St. Croix, Wis- 
consin, and ’ Taylors Falls, Minnesota, some observations were 
made on the introduced plants. The route covered was over the 
Northern Pacific from Minneapolis to Walker and Cass Lake; 
from Cass Lake over the Great Northern Railway to Duluth, 
and via the Northern Pacific to St. Croix Falls, Wisconsin. 
The weeds of the region have been given by Upham^ in his 
Catalogue of the Flora of Minnesota. 
The plants of the St. Croix region were listed by Dr. C. C. 
Parry.2 
The plants listed here are based on observation at various sta- 
tions, although collections of plants were made in Cass Lake, 
Star and Cedar Islands and the vicinity. Collections were also 
made in Duluth, St. Croix Falls and Taylors Falls. 
In order to list these plants in a convenient form I am ar- 
ranging the plants in the form of a table. 
Name of Plant 
Ames, Iowa 
St. Paul, Minn. 
Brainerd, 
Minn. 
C3 
. 
a 
M.S 
Duluth, Minn. 
St. Oroix Palls, 
Wis. • 
Amaranthus retroflexus 
+ 
+ 
+ 
+ 
Ambrosia artemisisafolia 
-f 
-f- 
+ 
Ambrosia trifida 
+ 
+ 
+ 
+ 
Artemisia biennis 
+ 
•-1- 
Achillea Millefolium 
+ 
+ 
+ 
+ 
+ 
+ 
Anthemis Cotula 
+ 
+ 
+ 
+ 
+ 
Arctium major. 
-r 
-f 
+ 
+ 
+ 
Agropyron repens 
^ + 
+ 
+ 
+ 
+ 
Agropyron Smithii 
+ 
+ 
■ + 
+ 
+ 
+ 
Brassica arvensis 
+ 
+ • 
+ 
+ • 
+ 
4- 
Brassica nigra 
+ 
+ 
+ 
+ 
Bidens frondosa 
-f 
+ 
+ 
H- 
+ 
Agrostemma Githago 
+ 
+ 
+ 
+ 
+ 
Asclepias syriaca 
+ 
+ 
^Geol. and Nat. Hist. Survey of Minn. Pt. VI, Progress Rep. 1883, 1 Map. 
2David Dale Owen. Rep. Geol, Survey, Wis., la. and Minn., 606-622. 
^ Philadelphia, 1852. 
