During the fall of 1914 the writer observed in the vicinity of Iowa City a tree of the common shag-bark hickory (Carya ovata (Mill.) K. Koch.) which produced a number of abnormal nuts.. As none of these were found with the husk intact no data can be given except for the nuts themselves. Bicarpillary fruits were not uncommon on this tree as at least a dozen examples were found without making a careful search. In most instances the paired nuts separated readily and showed no tendency toward adhesion. They were, however, very much flattened on the appressed surfaces. A cross section of these nuts showed them to be normal except in shape. Both lobes of the embryo were well developed, but somewhat distorted by the pressure. The walls of the shell were of about the same thickness on the free sides as were those of normal unicarpillary nuts from the same tree, while the inner appressed walls were very thin.
Proceedings of the Iowa Academy of Science
©1915 Iowa Academy of Science, Inc.
Wilson, Guy West
"An Anomalous Hickory-Nut,"
Proceedings of the Iowa Academy of Science, 22(1), 133-133.
Available at: https://scholarworks.uni.edu/pias/vol22/iss1/18