different between inflorescence vs cyathium

English

From Latin infl?r?scentia, from infl?r?sc? (“I begin to flower”), inchoative verb of fl?re? (“I flower”).

inflorescence (countable and uncountable, plural inflorescences)

(botany) Flower cluster; a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches.
An instance of a plant beginning to flower.

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

cyathium (plural cyathia)

One of the specialised pseudanthia ("false flowers"), surrounded by involucral bracts, especially those forming the inflorescence of euphorbias.

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