In studying this plant, the main object has been to bring out the characteristics of the glandular structures in Ptelea trifoliata and the differences between the glandular structure of this plant and other used in a like way as the hop.
Proceedings of the Iowa Academy of Sciences
©1894 Iowa Academy of Science, Inc.
Bigelow, Cassie M.
"Study of Glands in the Hop-Tree,"
Proceedings of the Iowa Academy of Science, 2(1), 138-140.
Available at: https://scholarworks.uni.edu/pias/vol2/iss1/30