Pulvinus

Rarity: Common

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Science and technology

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What Wikipedia says

A pulvinus (pl. pulvini) may refer to a joint-like thickening at the base of a plant leaf or leaflet that facilitates growth-independent movement. Pulvinus is also a botanical term for the persistent peg-like bases of the leaves in the coniferous genera Picea and Tsuga.

Excerpt from the Wikipedia article “Pulvinus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Rasbak, CC BY-SA 3.0, via Wikimedia Commons.