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An inflorescence in which the flowers arise from the base of a cuplike involucre.



a type of inflorescence characteristic of plants of the family Euphorbiaceae. A cyathium consists of a terminal apetalous pistillate flower surrounded by five groups (compound monochasium) of staminate flowers. Each flower has a single stamen whose anther filament is joined to the flower stalk. The inflorescence is enclosed by a cuplike involucre with nectar glands. A cyathium resembles a single flower (anthodium).

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Euphorbia astyla is a strongly perennial herb with a woody, thickened root and considerably larger cyathia and seeds.
Tiny gold pips in the centre of the bracts are the flowers, called cyathia.