What is pulvinus leaf base?

Dear student.

Pulvinus : A swelling at the base of leafstalk is because of changes in its turgor pressure cause in the position of the leaf. 
Common examples for pulvinar movement include the night closure movement of legume leaves and the touch response of the sensitive plant...e.g Mimosa pudica ( Touch me not plant)
Pulvinate leaves are present in Fabaceae and Marantaceae families 

Regards.

 

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