Twenty-nine species of seeds were tried out; of these the following germinated: Betula alba var papyrifera, (Marsh) Spach, Betula fontinalis Sarg., Quercus nigra L., Cinnamomum camphora L., Platanus occidentalis L., Physocarpus opulifolius var intermedius (Rydb.) Robinson Pyrus ioensis L., Cercis canadensis L., Amorpha canescens Pursh., Melia Azedarach L., Cissus ampelopsis Pers., Callicarpa americana L., Prunus Cerasus was collected germinating beneath the trees in April. Seeds of all northern species were wintered out-of-doors, lightly covered on the ground, and transferred to greenhouse about March 3.
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Pammel, L. H. and King, C. M.
"Further Studies of the Germination of Woody Plants,"
Proceedings of the Iowa Academy of Science, 31(1), 157-167.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/37