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03202031
HERBARIUM OF THE UNIVERSITY OF MICHIGAN
Photoperiodic Responses »1 Radi of Xanthium strumarium
Xanthium strumarium Sk*. complex ( S 6 6 annotation by Doris
Love)
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw County, Michigan.
Specimen prepared 4 0 C t. , 1 $63 by W. E. Alexander and B. G. Kang