dorsiventral
adjective
having distinct dorsal and ventral sides, as most foliage leaves.
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In the polypetalous forms progression from hypogyny to epigyny is generally recognized, and where dorsiventrality with insect-pollination has been established, a dominant group has been developed as in the Leguminosae.
From Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 by Various