Xanthium strumarium var. glabratum (DC.) Cronquist

03200078
1962
Oct.
HERBARIUM OF THE UNIVERSITY OF MICHIGAN
Photoperiodic Responses of Races of Xanthium strumarium
strumarium l., complex (see annotation by Doris Love)
in greenhouses of the University of Michigan Botanical Gardens,
Washtenaw County, Michigan.
Specimen prepared
by W. E. Alexander and B. G. Kang
and assigned seed lot no. 52-10
This plant is from the first
generation derived from the above seed.
Photoperiodic responses of this race are reported under strain no. 21	by
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. 53, pjf>. ffiSB ,	1966.
No. 61
Seed originally collected 31 Oct. 1962 at Wilburforce,
Greene Co., Ohio. 1.2£ mi. n. of college campus.
W. E. Alexander
03200078