Early in the spring of 1927 our attention was called to the prevalence of marsh cress in the state. This is not the first season that this weed has been so common. Apparently its appearance is more or less periodic or sporadic, depending upon weather conditions of the previous season.
Proceedings of the Iowa Academy of Science
©1928 Iowa Academy of Science, Inc.
Pammel, L. H.; King, C. M.; and Hayden, Ada
"March Cress, Its Geography and Ecology in Iowa,"
Proceedings of the Iowa Academy of Science, 35(1), 157-167.
Available at: https://scholarworks.uni.edu/pias/vol35/iss1/28