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The Four-O'Clock family is mostly native to the tropics, with only a handful of plants in the northern latitudes. The funnel-shaped flowers are usually bisexual with 5 united sepals and no true petals, although the sepals are colored like petals. There may be sepal-like bracts at the base of the flower. There are 5 stamens (sometimes 1 to 3). The ovary is positioned superior and consists of 1 carpel (unicarpellate). It matures as a dry seed (an achene). The sepals persist as the ovary matures.
Key Words: Tubular flowers with 5 colored sepals and no petals.
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