What is that yellow part of a paperwhite flower called?

I need to know what middle of a paperwhite narcissus flower called. The color is yellow. 10 points for the best answer.

What is that yellow part of a paperwhite flower called?
The interior part is called the "cup". The 6-petaled outer part is called the "perianth".
Reply:The trumpet! Honest - google it and look it up! Where's my 10 points? :)

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