Plant families how to know them : pictured-keys for determining the families of nearly all of the members of the entire plant kingdom / Jaques, H. E. Plants Identification. QK94 .J3 1948 581.1 JAP Includes index. Dubuque, Iowa : W. G. Brown, c1948. c1948. 1948 Text 177 p. : eng Pictured-key nature series