(in Cyperaceae) the basal part of the nutlet by which it is attached to the cupule within the glumes. In some species, not differentiated from the nutlet, in others it is distinct.
Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-17
Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M.
. Flora of Zimbabwe: Glossary details: hypogynium.
http://www.zimbabweflora.co.zw/speciesdata/glossary-display.php?glossary_id=360, retrieved 25 April 2017