The morphology of gymnosperms : the structure and evolution of primitive seed-plants / by K.R. Sporne. Sporne, K. R. Gymnosperms. Plant morphology. QK643.G99 S65 585 SPM Imprint covered by label, New York, Hillary House. Includes bibliographical references: (p. 199-210) and index. London : Hutchinson University Library, c1974. c1974. 1965 Text 216 p. : eng