nyctinasty

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nyctinasty

the so-called ‘sleep movements’ of plants in which the leaves regularly droop at night in a form of DIURNAL RHYTHM. The activity is particularly common in plants with compound leaves, such as Oxalis acetosella, the wood sorrel.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Ion Movements that Control Pulvinar Curvature in Nyctinastic Legumes.
The plant expresses nyctinastic leaf movements (sleep movement) with both the pinnae and petiole moving downward at night.
Leaves exhibit nyctinastic movements, moving down into a vertical position after dark, but diurnal heliotropic movements have not been observed.