(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: Mike Bingham, Annette Willemen, Bart Wursten, Petra Ballings and Mark Hyde, 2011-17
Bingham, M.G., Willemen, A., Wursten, B.T., Ballings, P. and Hyde, M.A.
. Flora of Zambia: Glossary details: hypogynium.
http://www.zambiaflora.com/speciesdata/glossary-display.php?glossary_id=360, retrieved 23 March 2017