Clifford, H. T. Keys to the families and genera of Queensland flowering plants (magnoliophyta) / H. T. Clifford, Gwen Ludlow. - St. Lucia, Q. : Queensland University Press, 1972. - 211 p. : ill. ISBN: 0702212253; 0702207195 Subjects--Topical Terms: Botany--Australia--Queensland.Plants--Identification.