The identification of weed seeds, though an important matter, is not an easy one. The average person knows Fox-tail, and probably that is about all. Even botanists, who have not given the subject special attention, will be surprised to find how small a number of weed seeds they are able to identify without study.
Proceedings of the Iowa Academy of Sciences
©1892 Iowa Academy of Science, Inc.
Stewart, F. C.
"The Key for the Identification of the Weed Seeds Found in Clover Seed,"
Proceedings of the Iowa Academy of Science, 1(Pt. 3), 84-90.
Available at: https://scholarworks.uni.edu/pias/vol1/iss3/24