The Collaborative International Dictionary
Ambigenous
Ambigenous \Am*big"e*nous\, a. [L. ambo both + genus kind.] Of two kinds. (Bot.) Partaking of two natures, as the perianth of some endogenous plants, where the outer surface is calycine, and the inner petaloid.
Wiktionary
ambigenous
a. 1 Of two kinds. 2 (context botany English) Partaking of two natures, as the perianth of some endogenous plants, where the outer surface is calycine and the inner petaloid.