|The Urticaceae are monoecious or dioecious herbs or infrequently shrubs or small trees comprising 45 genera and 700 species, often with specialized stinging hairs. The leaves are alternate or opposite, simple, and almost always stipulate. The minute, unisexual flowers are in cymose clusters. The perianth is of mostly 4 or 5 undifferentiated tepals or is sometimes absent. The male flowers have a stamen opposite each perianth segment. The female flowers have a single simple pistil with a superior or inferior ovary that contains one basal ovule in its solitary locule. The stigma is brushlike and elongated or is capitate. The fruit is an achene or drupe; in a few species these coalesce to form a multiple.
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