Verbatim text: Palmer, E. J. 1952. Crataegus. In: H. A. Gleason. 1952. The New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada. 3 vols. New York. Vol. 2, pp. 338–375.
Author: Palmer, E.J.
Year: 1952
Title: Crataegus
Editor: Gleason, H.A.
Book year: 1952
Book title: The New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada
Book volume: 3 vols
Volume: 2
Pages: 338–375