Pulvinus
（重定向自Pulvini）
![Section through the pulvinus of Oxalis rosea, from: Charles Darwin (1880): The Power of Movement in Plants.](/Images/godic/202502/05/Fig63Movement_of_Plants0635.png")
A pulvinus (pl. pulvini) is a joint-like thickening at the base of a plant leaf or leaflet that facilitates growth-independent (nyctinastic and thigmonastic) movement. Pulvini are common in members of the bean family Fabaceae (Leguminosae) and the prayer plant family Marantaceae.