noun
definition
A joint on a plant leaf or petiole that may swell and cause movement of the leaf or leaflet.
Examples of pulvinus in a Sentence
If the leaf of Mini osa or Desmodium be examined, it will be seen that at the base of each leaflet and each leaf, just at the junction with the respective axes, is a swelling known as a pulvinus.
In the erect position of the leaf the lower side has its cells extremely turgid, and the pulvinus thus forms a cushion, holding up the petiole.
These symbols were laid upon a couch (lectus), the left arm resting on a cushion (pulvinus, whence the couch itself was often called pulvinar) in the attitude of reclining.
Irritability resides in the pulvinus,in the pea and bean family, in rosaceous plants and the family Rubiaceae.