[flawr-i-juhn, flohr-]
a hypothetical plant hormone produced in the leaves and transported to the apex to initiate flowering.

florigenic, adjective
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World English Dictionary
florigen (ˈflɒrɪdʒən)
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-, flōsflower + -gen]

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