cyathium

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Related to cyathia: verticillaster

cy·ath·i·um

 (sī-ăth′ē-əm)
n.
An inflorescence consisting of a small cuplike structure enclosing a female flower and several male flowers, characteristic of plants in the genus Euphorbia, such as the poinsettia.

[New Latin, from kuathion, diminutive of kuathos, ladle.]

cyathium

(saɪˈæθɪəm)
n
a form of inflorescence of the type found on the poinsettia