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 (pŭl-vī′nəs, -vē′-)
n. pl. pul·vi·ni (-nī′)
A cushionlike swelling at the base of the stalk of a leaf or leaflet.

[Latin pulvīnus, cushion.]


n, pl -ni (-naɪ)
(Botany) a swelling at the base of a leafstalk: changes in its turgor pressure cause changes in the position of the leaf
[C19: from Latin: cushion]


(pʌlˈvaɪ nəs)

n., pl. -ni (-nī).
a cushionlike swelling at the base of a leaf or leaflet, at the point of junction with the stem.
[1855–60; < Latin pulvīnus cushion]
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References in periodicals archive ?
This pulvinus adjusts the position of both the branch and the bract that subtends it.
Uncus bifurcated at base, 1/2 times as long as tegument, each fork medium-long, slender at apex, broad at base; tegumen wide and arc-shaped, socii broad and wide, incurved at apex and strongly setose, shorter than uncus; gnathos degenerated; 1 pulvinus between tegument and valva, finger-shaped protuberance at pulvini; valva clavate, wide and thick at base; cucullus thin and long, strongly sclerotized; juxta similar triangle-shaped; saccus medium-long and thin.
Abstract: Some plant species both track and avoid the sun through turgor changes of the pulvinus tissue at the base of their leaves, maximizing light reception in dim conditions and minimizing cellular damage due to excessive light.
Table (2) shows that Bombax ceiba is morphologically distinct from Ceiba pentanda and Ceiba speciosa in thorn shape & color, trunk developed with butteresses, tree branching type, large pulvinus, petiole length (14.
5 cm long, equal or unequal, appressed; peduncle glabrous, sparsely puberulent below the base of the synflorescence; pulvinus puberulent to hirtellous; rachis 0.
EHD needs to be considered in the differential diagnosis of cattle with clinical signs that include fever; stomatitis; lameness; salivation; redness and scaling of the nose and lips; swelling of the tongue; and erosions of the pulvinus dentalis, palatinum, and nose.
Ionic column: a fluted column with a molded base and a capital composed of four volutes, usually parallel to the architrave with a pulvinus connecting a pair on each side of the column, and an entablature typically consisting of an architrave of three fascias, a richly ornamented frieze, and a cornice corbeled out on egg-and-dart and dentil moldings, with the frieze sometimes omitted.
Six tropical dry forest tree species (four with pulvinii and two without) were studied at the Area de Conservacion Guanacaste in Costa Rica to determine the role of the pulvinus organ in heat retention and herbivory.
Of the four species studied here, only Heliocarpus has a well-developed pulvinus, at the attachment point of the petiole and the leaf.