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

HERBARIUM OF THE UNIVERSITY OF MICHIGAN
Photoperiodic Responses of Races of Xanthium strumarium
Kanthium strumarium L., complex italiCUm (See aiino
f m	by	Doris Love?)
Grown in greenhouses of the University of Michigan Botanical Gardens,
Dixboro, Washtenaw County, Michigan.
196 ~$>y W. E. Alexander and B. G. Kang
Specimen prepared 25 Sept
NEW YORK BOTANICAL GARDEN
Seed originally collected Sept. 22, 1962atShore of Lake Erie
at end of Huron River Dr. , 3	of	Rockv.rood ,
by Wayne Go. , Mich.
,Ed/wa,rd.yo8s , collector
03199977
generation derived from the above seed.
Photoperiodic responses of this race are reported under strain no,
P. M. Ray and W. E. Alexander, Amer. Jour. Bot., Vol. 53, ijp. 2
03199977