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 „rumarium L„ complex (see	by	Doris	Lflve)
Grown in greenhouses of the University of Michigan Botanical Gardens
Dixboro, Washtenaw County, Michigan.
Specimen prepared n Qct. , 1963 by W. E. Alexander and B. G. Kang
No. 2
Seed originally collected 8 Aug# ^ ^	at	U	Tex>
8 mi. s. of	*
by Calvin McMillan
and assigned seed lot no. 62—2
This plant is from the
first
generation derived from the above seed.
Photoperiodic responses of this race are reported under strain no. £,	by
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. 53, py	i966
03
99968
NEW YORK BOTANICAL GARDEN
03199968