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A plant hormone that promotes flowering.
flor′i·gen′ic (-jĕn′ĭk) adj.
(Botany) the hypothetical plant hormone that induces flowering, thought to be synthesized in the leaves as a photoperiodic response and transmitted to the flower buds
[C20: from Latin flōr-, flōs flower + -gen]
flo•ri•gen(ˈflɔr ɪ dʒən, -ˌdʒɛn, ˈfloʊr-)
a hormone produced by leaves that stimulates flowering in plants.