| 释义 |
‖ pulvinus Bot.|pʌlˈvaɪnəs|
[L. pulvīnus cushion, pillow.]
Any cushion-like swelling or expansion of a stem or petiole; esp. a protuberance or enlargement at the foot of the petiole of some leaves, when large, turgid, and contractile, forming a special organ for movement of the leaf.
1857Henfrey Bot. §77 In woody Dicotyledons there is generally a little protuberance under the cicatrix, which is termed the pulvinus. 1880C. & F. Darwin Movem. Pl. 112 The summit of the petiole is developed into a pulvinus, cushion, or joint (as this organ has been variously called), like that with which many leaves are provided. 1906Athenæum 23 June 768/3 Mimosa..has in its pulvinus a structure which allows of the free play of the leaf. |