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

HERBARIUM OF THE UNIVERSITY OF MICHIGAN
Photoperiodic Responses of Races of Xanthium strumarium
Xanthium strumarium b., complex CllineHSe
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw ¡Gitlilf, Michigan.
Specimen prepared 23 JuiLy, 1932 by W. E. Alexander and B. G. Kang
No. 121
Seed originally collected
at MISSISSIPPI
by Robert Farmer
and assigned seed lot no.
This plant is from the first
generation derived from the above seed.
Photoperiodic responses of this race are reported under strain no. 6	by
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. 53, p^. glQ	1966.
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