Short-day plant

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1. a plant that requires a night longer than its critical dark period, usually 12 hours or more, to develop flowers.

poinsflower.jpg

This is a short day plant, which means they need the stimulus of restricted day length before they develop the flowers and coloured bracts.
Source: http://www.biotopics.co.uk/photos/poinsettia.html

bud_emergence300.jpg

The coffee plant is a short-day plant.
Source: http://www.ineedcoffee.com/04/flowering/