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1 A swelling at the base of a petiole or pinna, made up of cells that are capable of moving water in and out of their vacuoles quickly, resulting in movement of the petiole or pinna.

2 A thickened region at the node of a grass stem, often containing an intercalary meristem, which can raise the culm after lodging.

Subjects: Plant Sciences and Forestry.

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