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 (see annotation by Doris Love)
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw County, Michigan.
Specimen prepared 26 July- 1963 by W. E. Alexander and B. G.
Seed originally collected 2 NOV. 1962
Can. Jean Talou St., \ mi
by
Doris Love
and assigned seed lot no.	62- 3
at Montreal, P.Q
from Pic IX Blvd
generation derived from the above seed.
NEW YORK BOTANICAL GARDEN
Photoperiodic responses of this race are reported under strain no. 3!
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. 53, prf 810
03199950
03199950