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long-day plant

long-day plant in Science
long-day plant
A plant that flowers only after being exposed to light periods longer than a certain critical length, as in summer. Spinach, lettuce, and some varieties of wheat are long-day plants. Compare day-neutral plant, short-day plant. See more at photoperiodism.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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