Why is cyathium and hypanthium called special flower
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Answer:
A cyathium (plural: cyathia) is one of the specialised pseudanthia ("false flowers") forming the inflorescence of plants in the genus Euphorbia (Euphorbiaceae). A cyathium consists of:
Five (rarely four) bracteoles. These are small, united bracts, which form a cup-like involucre. Their upper tips are free and in the beginning cover the opening of the involucre (like the shutter of a camera). These alternate with:
Five (1 to 10) nectar glands, which are sometimes fused.
One extremely reduced female flower standing in the centre at the base of the involucre, consisting of an ovary on a short stem with pistil, and surrounded by:
Five groups (one group at the base of each bracteole) of extremely reduced male flowers, which each consist of a single anther on a stem.
a hypanthium or floral cup[1][2][3] is a structure where basal portions of the calyx, the corolla, and the stamens form a cup-shaped tube. It is sometimes called a floral tube, a term that is also used for corolla tube and calyx tube.[citation needed] It often contains the nectaries of the plant. It is present in most flowering species, although varies in structural dimensions and appearance.[4] This differentiation between the hypanthium in particular species is useful for identification. Some geometric forms are obconic shapes as in toyon, whereas some are saucer-shaped as in Mitella caulescens.