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Calotropis gigantea
''Calotropis gigantea'' (Crown flower) is a species of ''Calotropis'' native to Cambodia, Indonesia, Malaysia, Philippines, Thailand, Sri Lanka, India, China, Pakistan, Nepal, and tropical Africa.
It is a large shrub growing to tall. It has clusters of waxy flowers that are either white or lavender in colour. Each flower consists of five pointed petals and a small, elegant "crown" rising from the centre, which holds the stamens. The aestivation found in calotropis is valvate i.e. sepals or petals in a whorl just touch one another at the margin,without overlapping.The plant has oval, light green leaves and milky stem. The latex of ''Calotropis gigantea'' contains cardiac glycosides, fatty acids, and calcium oxalate.
==Pollination==
This plant plays host to a variety of insects and butterflies.
''Calotropis'' is an example of entomophily pollination (pollination by insects) and pollination is achieved with the help of bees. In ''Calotropis'', gynostegium is present (formed by the fusion of stigma and androecium). The pollen are arranged in a structure named pollinia which are attached to a glandular, adhesive disc at the stigmatic angle (Translator Mechanism). These sticky discs get attached to the legs of visiting bees so that pollinia are pulled out when the bee moves away. When such a bee visits another flower, this flower gets pollinated by the sticky pollinium.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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