Opportunity for leaf count and area measurement of the foliage of an entire tree was afforded when on August 25, 1933 a catalpa (Catalpa speciosa) was felled on the west side of the Old Capitol on the University of Iowa Campus. The tree was located seventy-six feet southeast of the intersection of the east walk of Madison Street and Iowa Avenue. It stood on an open lawn near the base of a long five percent slope, removed more than 150 feet from any large trees on the east or south, therefore receiving direct sunlight throughout the morning and early afternoon. A double oak forty-eight feet high was located fifty-seven feet to the southwest and shaded the catalpa from late afternoon sun. A vigorous elm seventy-six feet high stood eighty feet to the northwest.
Proceedings of the Iowa Academy of Science
©1934 Iowa Academy of Science, Inc.
Turrell, Franklin M.
"Leaf Surface of a Twenty-one-year old Catalpa Tree,"
Proceedings of the Iowa Academy of Science, 41(1), 79-84.
Available at: https://scholarworks.uni.edu/pias/vol41/iss1/10