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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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Pseudanthium development in Calycopeplus paucifolius, with particular reference to the evolution of the cyathium in Euphorbieae (Euphorbiaceae-Malpighiales).
Euphorbia belongs to family Euphorbiaceae and order Euphorbials with annual and perennial plants which have cyathium in florescence and laticifer.
Nectaries of Chamaesyce, in which nectaries occur in the inflorescence, as in Euphorbia (So 2004) and Poinsettia, but are morphologically extrafloral (the cyathium being comprised of individual flowers of gynoecium or androecium only) might function in pollination as well as potential anti-herbivore defense, depending on the ecological context.