The subject of weeds, no matter where they occur, is always of perennial interest. They travel apparently from one end of the country to the other. Sometimes they become permanent and sometimes are only transient. Sometimes they persist for a few years and then disappear; of this Lactuca scariola L. and its variety is an illustration.
Proceedings of the Iowa Academy of Science
©1927 Iowa Academy of Science, Inc.
Pammel, L. H.
"Weeds of California and Their Relation to Weeds in Other Sections of Country,"
Proceedings of the Iowa Academy of Science, 34(1), 153-163.
Available at: https://scholarworks.uni.edu/pias/vol34/iss1/32