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Term Definition
Operculum The lid of the fruit of species with circumscissilely dehiscent fruits as found in many species of Lecythidaceae; a valvelike opening into the stony endocarp of the fruit of some species (e.g., Humiriaceae); referring to a seed with an opening covered by a lid (e.g., Zingiberaceae) or the membranous cover of the nectary in Passiflora (Passifloraceae). Drawing of Lecythis pisonis by B. Angell
Operculum (plural = opercula) Lid-like; the lid of a dehiscent fruit as found in many, but not all, Lecythidaceae. Circumferentially winged seeds and leaf-like cotyledons of Couratari. Drawing by B. Angell.