Xanthium strumarium var. glabratum (DC.) Cronquist

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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.
Specimen prepared ^ Qct. , 1963	by	W.	E.	Alexander	and	B.	G.	Kang
No. 53
Seed originally collected April, 19&3	at	Cincinnati,	Ohio,
10 mi. W. on Hwy 5>0.
by
Walter Talbott
and^as^igi^ 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. l8	by
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. 53, pji. 810,	1966.
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