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

Xanthium strumarium L., complex italicum
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw County, Michigan.
Specimen prepared 26 Oct • , 196^	by W. E. Alexander and B. G. Kang
No. *f26
Seed originally collected 16 June, 1963 at Queretaro, Mex.
by C. R. Bell
and assigned seed lot no. 63“^8
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, pi/ 8lO ,	1966.
(response similar to that of strain no« l) •
03199987