Synonyms for Calyculus (same or very similar meaning)
WordNet sense 1 (a group of bracts simulating a calyx as in a carnation or hibiscus):
calycle, epicalyx, false calyxWordNet sense 2 (a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp)):
caliculusFrom the ODE community, based on WordNetadd/edit