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

HERBARIUM OF THE UNIVERSITY OF MICHIGAN
Photoperiodic Responses of Races of Xanthium strumarium
Xanthium strumarium L., complex OVif Ornie
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw County, Michigan.
Specimen prepared 16 Sept • f 19&3 ^y W. E. Alexander and B. G. Kang
No. 16
Seed originally collected 31 Aug* , 1962 at Canajoharie* N*
(along New York thruway)
by
y P. M. Ray
and assigned seed lot no. 62—6
This plant is from the first	generation	derived from the above seed.
Photoperiodic responses of this race are reported under strain no. 31	by
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. 53, ppi 810 ,	1966.
03199937