Androecium
Androecium of
the flower is made up of the male reproductive parts i.e. microsporophyll or
stamens. It occupies a position outward from the gynoecium and inward from the corolla. But the
stamens are sometime inserted on the corolla (epipetalous) and sometime stamens
are attached to the pistil (gynandrous). In
all perigynous
flowers the stamens are inserted on a hypanthium (the
calyx-tube and surrounding tissue which gives rise to petals and stamens.)
Each
stamens are attached to one another in two general ways- by union of their
filaments into on group i.e. monoadelphous
Two
groups- diadelphous
Many
groups- polyadalphous
Anthers
into a ring- syngenesious
Epiphyllous-
filaments are remain united with perianth leaves and anthers are free. E.g.
Onion
Epipetalous-
Filaments are united to petals e.g. Sunflower, potato, Datura,
Ipomoea, Brinjal, etc.
Gynandrous-
Stamens are united to carpel. E.g. Calatropis, Aristolochia, Cryptostegia
Monoadelphous-
filaments form a single tube like structure and anthers remain free. E.g. Azadiracta,
Crotalaria, Hibiscus
Diadelphous-
filaments fused to form two bundles. E.g. Sesbania, Clitoria
Polyadlephous-
filaments are attached to form a number of bundles and anthers remain free.
E.g. Citrus, Bombax
Synandrous-
anthers remain free and filaments are attached. E.g. Cucurbita
Syngenesious-
anthers are attached and filaments are free. E.g. Sunflower, Tridax,
etc
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