The topsoil from an Iowa State University building site was piled for reuse. The site had been mulched with local oat straw the previous winter, and the pile developed a flora of remarkable diversity and vigor. Plants of 44 species, representing 32 genera of 14 families were identified on the soil pile. Soil from beneath the surface of the pile was collected and placed in greenhouse flats, and the emerging seedlings were counted and identified during a 10 months period. Twelve additional species, representing 11 genera and 8 families, which had not been collected on the soil heap were found in the greenhouse.
Proceedings of the Iowa Academy of Science
©1963 Iowa Academy of Science, Inc.
Pohl, Richard W. and Loomis, Walter
"Ecesis of a Weed Flora,"
Proceedings of the Iowa Academy of Science, 70(1), 55-58.
Available at: https://scholarworks.uni.edu/pias/vol70/iss1/11