Hypanthodium has a flask-shaped fleshy receptacle which possesses a narrow canal and a terminal pore at one end. The pore is surrounded by a few scales while the canal is lined by downwardly pointed hairs.

For more details about hypanthodium inflorescence and diagram go through this link :-

https://www.biologydiscussion.com/plants/inflorescence/types-of-inflorescence-5-types-with-diagram-plants/70252