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

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YORK BOTANICAL GARDEN
03199983
HERBARIUM OF THE UNIVERSITY OF MICHIGAN
Photoperiodic Responses of Races of Xanthium strumarium
Xanthium strumarium L., complex (see annotation by DorlS
Love)
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw County, Michigan.
Specimen prepared 1Sent. ,	19 6 3 ky W. E. Alexander an<i B. G. Kang
No. 25
Seed originally collected	at0	CblcagO	,	111.
(Standard strain used in phoperiod work. )
by Seed supplied by William Chorney
and assigned seed lot no. £ 2—17
This plant is from the C a .	10 generation derived from the above seed.
supplied originally by Dr. Wayne Mcllrath, Chicag<|
Photoperiodic responses of this race are reported under strain no. 250	by
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. S3, p^ <310 9	1966.
03199983