Nectary


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nectary

[′nek·tə·rē]
(botany)
A secretory organ or surface modification of a floral organ in many flowers, occurring on the receptacle, in and around ovaries, on stamens, or on the perianth; secretes nectar.

Nectary

 

the glands of a plant that secrete a sugary juice, or nectar. Nectaries are generally located in the interior of the floral cup, but they are sometimes situated outside of the flowers. The glands promote cross-pollination by attracting pollinators, primarily insects, to the flowers. (In the tropics, birds and, on rare occasions, bats serve as pollinators.)

Nectaries occur on the flower receptacle (for example, in the honeysuckle Lonicera iberica), on the interior or superior side of the sepals (in lindens), inside the spur (in nasturtiums), on the petals (in crowfeet), on the processes of the staminal connective (in violets), or at the base of the pistil (in buckwheat). In flowers that have an inferior ovary (plants of the families Umbelliferae, Dipsacaceae, and Compositae), the nectaries are located over the ovary and around the base of the styles. In some plants, flower organs (for example, the petals of meadow saffron) are converted into nectaries; in some rare cases (edelweiss and some acacias) a few flowers in the inflorescence develop into nectaries. Extra-floral nectaries are located on the basal parts of the cotyledons (in Ricinus), on the petioles (in mazzard cherry and plum), on the stipules (in vetch), on the bracts (in cotton), or on the leaflets of the involucres (in some species of Centaurea).

The cells of the tissue that elaborates nectar are for the most part small, thin-walled, and rich in protoplasm; often they constitute groups of special epidermal cells lacking cuticles (for example, the nectaries of apple blossoms). Nectar is usually secreted through the walls of the surface cells or, in some cases, through special stomata.

References in periodicals archive ?
In Sonneratia the flowers are much larger and structurally much thicker (22-33 x 12-22 mm in mature bud) than those of Sahnianthus; the ovary is superior to partly inferior; stamens are many (up to 300 fide Duke & Jackes, 1987) and multiseriate; a saucer-shaped nectary surrounds a very short-stipitate ovary (Mahabale & Deshpande, 1957); and the fruit is ah indehiscent, thick-walled berry with a pulpy interior (Backer & van Steenis, 1954; Duke & Jackes, 1987).
Cahn suggests that soft, creamy items tend to match up well with all that nectary sweetness.
Tripping in its simplest form occurs when the staminal column is released under the weight of a pollinating insect as it alights on the wing-petal and forages on the intrastaminal nectary at the base of the ovary.
To do this, I drained nectar from four flowers on each plant using a microsyringe fitted with a flexible tubing tip to prevent flower and nectary damage.
leucocephala presents in an extrafloral nectary on the petiole (Hughes 1998), is responsible for keeping ants constantly foraging on plant leaves (Dattilo 2009).
The species is easily recognized by the presence of an extrafloral nectary on the pulvinus, a characteristic not encountered among congener species in the area, and by the presence of oval elliptical proximal leaflets and elliptical distant leaflets.
Species similar to Psittacanthus lasianthus, from which it differs by the sympodial, densely puberulous, three-angled stems, ternate leaves, terminal dichasia, perfoliate bracts, a neck-bearing, not inflated corolla densely laciniate on its outer surface and a triangular, ligule on the inside of each petal, a ring-like nectary, and a micropapillose stigma versus percurrent, glabrous, circular stems, paired leaves, axillary dichasia, not perfoliate bracts, a neck-lacking, inflated corolla without laciniae on its outer surface and a finger-like ligule on the inside of each petal, a 4-lobed nectary, and a smooth stigma in P.
Influence of extrafloral nectary phenology on ant-plant mutualistic networks in a neotropical savana.
A number of Saxifraga species have a monosymmetric corolla and nectary (Engler, 1930).