long-day

[lawng-dey, long-]

long-day

[lawng-dey, long-]
adjective Botany.
requiring a long photoperiod in order to flower.

Origin:
1915–20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Long-day is always a great word to know.
So is archegonia. Does it mean:
organism with having only one complete set of chromosomes
female reproductive organ which produces eggs in bryophytes, ferns and most gymnosperms
Collins
World English Dictionary
long-day
 
adj
Compare short-day (of certain plants) able to mature and flower only if exposed to long periods of daylight (more than 12 hours), each followed by a shorter period of darkness

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