|The Nyctaginaceae are herbs, shrubs, and trees comprising 30 genera and 300 species further characterized by the presence of betalains and p-plastids. The leaves are simple, entire, estipulate, and usually opposite. The flowers are usually bisexual, have a 3-8-lobed uniseriate perianth of connate, petaloid sepals and are subtended by bracts that range in appearance from large and brightly colored to reduced and calyx-like. The androecium consists of 1-30 hypogynous, commonly unequal stamens that may be free or connate into a basal tube. The gynoecium is a single simple pistil with a superior ovary containing one locule and one basal ovule. The fruit is an achene that is often enveloped by the persistent base of the calyx tube.
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