a small cup-like structure, characteristic of the genera Euphorbia, Monadenium and Synadenium, bearing on its rim variously-shaped glands (these sometimes separate and circular or crescent-shaped or fused into an entire marginal rim) with alternating lobes; within this cup are several naked male flowers, consisting of a stalked stamen and bracteole, and 1 central female flower bearing a 3-locular ovary with 3, often 2-fid, styles.
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: cyathium.
http://www.zimbabweflora.co.zw/speciesdata/glossary-display.php?glossary_id=191, retrieved 26 March 2017