The Collaborative International Dictionary of English v.0.48:

Gynantherous \Gy*nan"ther*ous\ (j[i^]*n[a^]n"th[~e]r*[u^]s), a.
   [Gr. gynh` a woman + E. anther.] (Bot.)
   Pertaining to an abnormal condition of the flower, in which
   the stamens are converted into pistils. --R. Brown.
   [1913 Webster]