During a survey of the loess bluffs flora of the Missouri River border of Iowa, Morrill (1953) discovered a few individuals of an unknown weed growing on bare vertical loess south of Council Bluffs. It proved impossible to identify this plant with any of the usual American manuals. It eventually was determined to be Thymelaea passerina (L.) Coss. and Germ. Inquiries addressed to the principal American herbaria revealed that only one specimen of the plant had been previously collected in this country. This was found in a pasture in Cedar County, Nebraska, in the northeastern corner of the state.
Proceedings of the Iowa Academy of Science
©1955 Iowa Academy of Science, Inc.
Pohl, Richard W.
"Thymelaea Passerina, A new Weed in the United States,"
Proceedings of the Iowa Academy of Science, 62(1), 152-154.
Available at: https://scholarworks.uni.edu/pias/vol62/iss1/19