Characteristics of Umbelliferae
Habit: These are herbs (rarely shrubs). The stem is usually fistular.
Leaves: The leaves are alternate, simple, often much divided, sometimes decompound; petiole usually sheathing at the base.
Flowers: The flowers are regular (actinomorphic) or sometimes zygomorphic, epigynous, bisexual, or polygamous. The outer flowers are sometimes rayed; mostly protandrous. The bracts are in the form of an involucre.
Inflorescence: It is an umbel, usually compound or in a few cases simple as in Centella.
Calyx: There are five sepals. They are free, adnate to the ovary, often considerably reduced in size.
Corolla: The petals are five, rarely absent, free, adnate to the ovary, and sometimes unequal. The margin is often curved inwards, valvate or imbricate.
Androecium: There are five stamens, which are free, alternating with the petals, epigynous. The filaments are bent inwards in the bud; anthers introrse.
Gynoecium: The carpels are two, syncarpous. The ovary is inferior, two-celled, anteroposterior, crowned by a two-lobed, epigynous disc (stylopodium), with two freestyles arising from it. The stigmas capitate. There are two ovules, solitary in each cell and pendulous.
Fruit: The fruit is a cremocarp consisting of two indehiscent carpels laterally or dorsally compressed, breaking up into two parts, called mericarps, which are attached to a slender, often forked axis (carpophore). Each mericarp usually shows five longitudinal ridges and oil canals (vittae) in the furrows.
Seeds: There are two seeds, one in each mericarp; albuminous.
Examples: Fennel, coriander, caraway, dill, etc.
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