plant-flower-05-grasses

plant-flower-05-grasses - long distances The cereals wheat...

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Flower Structure 5 - Grasses The flowers of the grasses are tiny, inconspicuous and carried in dense inflorescences*. There are no petals or sepals in the usual sense, but the reproductive organs are enclosed in two green, leaf-like structures called bracts . The ovary contains one ovule and bears two styles with feathery stigmas. There are three stamens, the anthers of which, when ripe, hang outside the bracts. Grasses are not pollinated by insects but by the wind. When the stamens are mature they release pollen which is carried by the wind. The feathery stigmas protrude outside the bracts and trap the wind-carried pollen. The pollen grains are very light and smooth and can be blown for
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Unformatted text preview: long distances. The cereals wheat, oats, barley, maize, etc. are grasses especially bred and cultivated by humans for the sake of the food stored in the fruits or seeds of their flowers. * An inflorescence is a group of flowers carried on the same stalk Rye grass. The inflorescence and flowers of this grass are illustrated below. Rye grass inflorescence Single spikelet flower Mature flower (one bract removed) stamen spikelet (a group of flowers) bract anther filament stigma ovary Immature flower opened to show structure stamens dangle outside flower © D.G. Mackean...
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