Xanthium strumarium var. glabratum (DC.) Cronquist

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 ^ Nov*, 1964 by W. E. Alexander and B. G. Kang
No. 439
Seed originally collected ^6 Oct*, 1963 at	Orange	Co*,
1/2 mi* up dead end rd*#19l8 2 mi* up Farrington Bd*
by from junction of hwy. 15-501*
M.E. & W. Sparrow, collectors*
and assigned seed lot no. 6j-%5
This plant is from the first	generation	derived from the above seed.
Photoperiodic responses of this race are reported under strain no. ^7	by
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. 53, pj/ 8l0 ,	1966
03200093