Xanthium strumarium var. glabratum (DC.) Cronquist

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BOTANICAL
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HERBARIUM OF THE UNIVERSITY OF MICHIGAN
Photoperiodic Responses of Races of Xanthium strumarium
Xanthium strumarium L., complex chinense
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw County, Michigan.
Specimen prepared June f 19&5 by W. E. Alexander and B. G. Kang
No.
Seed originally collected
Co., Ky.
by Edward Strong
and assigned seed lot no. 6*f-07
This plant is from the first
at Vanceburg, Lewis
generation derived from the above seed.
!5 BOTAN ICAL GARDEN
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Photoperiodic responses of this race are reported under strain no. ^5
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. 53, pj/ &10,	19g6
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