The Collaborative International Dictionary
Receptacular
Receptacular \Rec`ep*tac"u*lar\ (r[e^]s`[e^]p*t[a^]k"[-u]*l[~e]r), a. [Cf. F. r['e]ceptaculaire.] (Bot.) Pertaining to the receptacle, or growing on it; as, the receptacular chaff or scales in the sunflower.
Wiktionary
receptacular
a. (context botany English) Pertaining to, or growing in, the receptacle.