plant-flower-04-compositae

plant-flower-04-compositae - ovule in the ovary. In some...

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Flower structure 4 - Compositae Composite flowers (Compositae). The ‘flowers’ in plants such as daisies, dandelions, hawkweeds, marigolds, dahlias etc. consist, in fact, of a dense group of many flowers called an inflorescence . What at first appears to be a petal in the ‘flower’ head is actually a tiny, but complete flower often called a floret. In the outer florets of the dandelion inflorescence there are five petals joined together to form a tube at the base, but flattening out at the top. The sepals are reduced to a whorl of fine hairs. The five anthers are joined together and grouped round the style, which has a forked stigma. There is a single
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Unformatted text preview: ovule in the ovary. In some compositae, the outer florets with conspicuous petals have no reproductive organs and are said to be sterile florets. It is the inner florets, each with a tube of tiny petals, which carry the reproductive organs .The various daisies are examples of this type of inflorescence. 5 joined petals stigma style 5 joined anthers filament sepals (reduced to hairs) ovary Single floret of dandeli on single flower (floret) the outer florets are sterile (i.e. no reproductive organs) only the inner florets have stamens and ovaries A hawkweed inflorescence A daisy inflorescence D.G. Mackean...
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