pulvinus

[ puhl-vahy-nuhs ]

Phonetic (Standard)IPA

noun

, plural pul·vi·ni [puhl-, vahy, -nahy].

Botany. a cushionlike swelling at the base of a leaf or leaflet, at the point of junction with the axis.
Architecture. pulvinar ( def 2 ).

pulvinus

/ pʌlˈvaɪnəs /

a swelling at the base of a leafstalk: changes in its turgor pressure cause changes in the position of the leaf

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First recorded in 1855–60, pulvinus is from the Latin word pulvīnus cushion

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C19: from Latin: cushion

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The specimen employed was a terminal leaflet of Desmodium gyrans (Fig. 122) the pulvinus of which is very sensitive to light.

Effect of increasing intensity of light on the pulvinus of Desmodium gyrans: Experiment 129.

Before describing the experiment I shall demonstrate the tropic reactions of the two halves of the pulvinus of Mimosa.

A series of such positive responses of the upper half of the pulvinus is given in figure 118.

The velocity of transmission of excitation in a transverse direction through the pulvinus is about 0·011 mm.

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