different between inflorescence vs involucre

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.

involucre (plural involucres)

(botany) Conspicuous bract, bract pair or ring of bracts at the base of an inflorescence.

involucre

First-person singular (yo) present subjunctive form of involucrar.
Formal second-person singular (usted) present subjunctive form of involucrar.
Third-person singular (él, ella, also used with usted^?) present subjunctive form of involucrar.

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