Xanthium strumarium var. glabratum (DC.) Cronquist

HERBARIUM OF THE UNIVERSITY OF MICHIGAN
Photoperiodic Responses of Races of Xanthium strumarium
Xanthium strumarium L., complex pansylvailicum
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw County, Michigan.
Specimen prepared ^8 July * 1962 by W. E. Alexander and B. G. Rang
no.107
Seed originally collected 1961	at	Mooreville,	Mioh.
York Twp,, Moon Road*	(Washtenaw Co*)
by William Reiman
and assigned seed lot no. 61—7A
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, p^ *	1966.
03200094