plant-flower-tropical-02 - ornamental shrub Sepal Petal...

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Flower structure (tropical) 2 Caesalpinia and Thunbergia Variations In many flowers, petals or sepals are joined for part of or all of the way along their length, forming tubular structures as in Tecoma and Thunbergia . In flowers like Caesalpinia the petals are not joined. In many others, which have joined or free petals, some petals differ in size and shape from others, as in Crotalaria . Caesalpinia pulcherrima Five sepals, not joined; five petals, one being much narrower than the rest and having a nectary at its base; a single ring of ten stamens with very long filaments; a single pod-shaped ovary which contains a row of ovules, and has a long style projecting from it. Caesalpinia is a shrub from South America but widely planted throughout the tropics as an
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Unformatted text preview: ornamental shrub. Sepal Petal Carpel Stamen anther filament stigma Thunbergia grandiflora is an ornamental climbing plant; very attractive, but can be invasive in some countries. The flower petals (blue or white) are joined together to form a tube, except at their tips. When a bee enters this tube to reach the nectar, the anthers deposit pollen on its back. When the bee visits an older flower, the pollen is picked up by the stigma. This is the principle of pollination. anthers deposit pollen on the bee’s back nectary petal tube style stigma bee’s ‘tongue’ reaching for nectary ovary Half flower of Thunbergia grandiflora showing pollination Flower parts of Caesalpinia ovary style © D.G. Mackeam...
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