botany

[Jonsey]

a plant whose petals close at night

 

n _ c _ i _ a _ t _

[donslot]

Are you certain about all your letters ?

I found a reference to NIKRAIKA - a lotus plant. Hope it helps.

[Marsh]

Nyctinasty is "a nastic movement, such as the closing of petal, that occurs in response to the alternation of night and day."
Collins English Dictionary

Not quite what you want but it might give you a start.

[Marsh]

--- petals ---

[heatherglen]

nyctinasty  nyctitropism-the so called sleep of plants