title: Effect of Rotation on Flowering Response of Xanthium pennsylvanicum.
abstract: The flowering response of Xanthium pennsylvanicum Wallr. is attenuated when the plant is rotated around a horizontal axis at the rate of 0.25 rev/min. Rotation prior to an inductive dark period has the strongest effect.
authors.forename: T
authors.initials: T
authors.lastname: Hoshizaki
authors.forename: K C
authors.initials: KC
authors.lastname: Hamner