http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
different forms of flowers on plants of the same species
xxxii, 352 pages : illustrations ; 21 cm.
Charles Darwin ; with a new foreword by Herbert G. Baker.
Reprint. Originally published: London : J. Murray, 1877.
Includes bibliographical references and index.