zygophytehttp://www.oed.com/dictionary/zygophyte_n%3Ftab%3Dmeaning_and_usezygophyte, n.
First published 1921; not fully revised

zygophytenoun

  1. 1885–
    A plant which reproduces by conjugation.
    1. 1885
      The sexual process in Zygophytes is characterized by the confluence of the protoplasmic masses of two very similar cells by which a new mass is formed as the starting-point of the new individual.
      G. L. Goodale in A. Gray & G. L. Goodale, Botanical Text-book (ed. 6) vol. II. ii. xiv. 439

Originally published as part of the entry for zygo-, comb. form

zygo-, comb. form was first published in 1921; not fully revised.