title: Requirements for Floral Initiation of Los Angeles Xanthium.
abstract: Cocklebur from the Los Angeles area was found to require more extensive short-day treatment for floral initiation than plants of the same species from the Chicago region. Data obtained by grafting the two regional types of cocklebur indicate that the leaves of the Los Angeles Xanthium produce a comparatively low amount of the flowering stimulus.
authors.forename: B H
authors.initials: BH
authors.lastname: Carpenter
authors.forename: R G
authors.initials: RG
authors.lastname: Lincoln