heterogonousIn botany, having dissimilar reproductive organs: a term proposed by Asa Gray, in 1877, to include such flowers as are dimorphic or trimorphic in regard to the relative length of stamens and pistils. These flowers were first called diœcio-dimorphic by Torrey and Gray, in their “Flora of North America.” Darwin, who was the first to interpret correctly the meaning, first termed this kind of blossom simply dimorphic (Jour. Linn. Soc. Lond. 1862, p. 77), but later, in 1877, in his “Forms of Flowers,” he adopted Hildebrand's epithet heterostyled for it. These terms are, however, objectionable, since the differences affect the andrœcium, and even the pollen, as well as the style. Sometimes also heterogoneous, heterogone.
Chambers's Twentieth Century Dictionary
adjHeterogonoushet-e-rog′ō-nus (bot.) having flowers dimorphous or trimorphous as to the relative length of stamens and styles, an adaptation for cross-fertilisation.