androecium


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androecium

[‚an′drēsh·ē·əm]
(botany)
The aggregate of stamens in a flower.
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endressii) are known as spikes of bisexual flowers with the androecium attached to the back of a carpel, but the New Jersey species (C.
Habit Shrubs to 5 m tall (exceptionally to 10 + trees to 40 m tall m tall) Stipule margin laciniate entire Leaf blade membranaceous, margin chartaceous, plane margin revolute Number of lateral 8 to 11 4 to 8 veins on each side Branching, 2-forked, axillary to the 4 to 6-forked, mostly on position and size distalmost leaves, to 1 defoliate branches, to 3.5 of dichasia x 1 cm x 2.5 cm Length of 2.5-3.5 mm 3-8 mm dichasial peduncle Calyx, corolla 4 or 5 5 and androecium merosity Sepal margins erose entire Samara two-celled, one-seeded, one-celled, one-seeded, 16-19 x 5-6 mm, 20-28 x 7.5-17 mm, higher higher order veins order veins prominent inconspicuous Geographic Colombia (Boyaca), N Venezuela (Aragua, DF, distribution and 2740-2950 m Vargas, Miranda Yaracuy), elevation below 1000 m.
11 cm diam., assimetric; sepals green to green-vinaceous, deltoid to ovate or ovate to elliptic, abaxial surface glabrous, 18-36 X 7-18 mm; petals golden yellow, two external, ovate, 14-36 X 7-21 mm, two internal, orbicular, 12-31 X 8-22 mm, cuculus obovate to elliptic, bent around the androecium, 12-27 X 07-13 mm; stamens light yellow, 6-24 mm long; staminoids 3-5 mm long; ovary light green, pubescent, 16-33 mm long; style light green, 2-5 mm long.
Corolla dissected to show interior glabrous surface, except on the dorsal lobes where it is densely glandular; androecium curled toward the corolla base indicating the flower was in the female stage.
Staminate flowers 2.5-2.6 mm diam., in small, short-stalked, axillary panicles 10-18 mm long; pedicel slender, 2.5-3 mm long, glabrous; sepals very reduced; hypanthium patelliform, 1.5 mm diam., with an inner ring of nectarigenous trichomes between the androecium and the petals; petals greenish white, triangular, 0.75 mm x 0.75 mm; androecium with one horizontal, circular rimose (syn)anther, 0.75-0.8 mm diam., on a very reduced stalk (almost sessile), and fringed by simple trichomes around the lower side.
In addition, the androecium is often differentiated into middle length stamens with nutritive anthers (medium), that provide food for pollinators, and long length stamens with pollinating anthers (long), that provide pollen that is deposited on the stigma (Van der Pijl 1954, Faegri and van der Pijl 1966, Proctor and Yeo 1973).
They are the male reproductive parts of the flower and are collectively called the androecium. The word "androecium" (an-DREE-seeum) comes from the Latin word andros (man) and the Greek word oikos (house), which literally translates to "house of man."
If so, and if this allocation had a genetic basis, then a negative genetic correlation might exist between allocation to the androecium and the gynoecium of flowers.
Some common characteristics were also observed among species pollinated by bat like nocturnal white flowers and androecium with anthers positioned in a single direction of the flower, which allows the access of bats to flowers, increasing the pollination efficiency.
Among the most important characters for distinguishing the genus is the presence of a zygomorphic androecium with three abaxial stamens; presence of convex, claviform to pyramidal extrafloral nectaries and cylindrical or plane-compressed fruit with inert dehiscence.