Xanthium strumarium var. canadense (Mill.) Torr. & A.Gray

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HERBARIUM OF THE UNIVERSITY OF MICHIGAN
Photoperiodic Responses of Races of Xanthium strumarium
Xanthium strumarium l., complex (see annotation by Doris Love)
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw County, Michigan.