Oxalis succulenta, pre-nocturnal wilting

Oxalis succulenta, pre-nocturnal wilting

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Sleep movement in the plant Oxalis succulenta. Sleep movement has many of the appearances of wilting. It occurs in the afternoon on sunny days, and is thought to be a defence mechanism against water loss and excess cooling during the night. The precise way in which this is effected is unknown, but it is thought to be triggered by the change of the colour of sunlight toward the end of the day. Compare this with B740/187, the same plant seen six hours earlier.

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Keywords: botany, leaf, leaf move, leaves, nature, oxalis succulenta, plant, plants, sleep movement, wilting

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