receptacular

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]