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An umbel is an inflorescence which consists of a number of short flower stalks (called pedicels) which spread from a common point, somewhat like umbrella ribs. The word was coined in botany in the 1590s, from Latin umbella "parasol, sunshade."[1] The arrangement can vary from being flat topped to almost spherical. Umbels can be simple or compound. The secondary umbels of compound umbels are known as umbellules or umbellets.[2] A small umbel is called an umbellule.[2] The arrangement of the inflorescence in umbels is referred to as umbellate, or occasionally subumbellate (almost umbellate).
Umbels are a characteristic of plants such as carrot, parsley, dill, and fennel in the family Apiaceae; ivy, aralia and fatsia in the family Araliaceae; and onion (Allium) in the family Alliaceae.
An umbel is a type of indeterminate inflorescence.[2][3] A compressed cyme, which is a determinate inflorescence, is called umbelliform if it resembles an umbel.
Compound umbel of a hemlock-parsley, Conioselinum pacificum (Apiaceae)
Umbel of a wild carrot, Daucus carota (Apiaceae)
An umbel of Fatsia japonica (Araliaceae)
Involucrate umbels of Primula veris.
Umbel, Fruit, Raceme, Botany, Plant ecology
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Inflorescence, Cordyline, Yucca, Aloe, Agapanthus