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The family Polygonaceae, also known as the knotweed family or smartweed family, are a group of dicots, comprising about 50 genera and 1120 species of monoecious and dioecious herbs, shrubs and small trees. Some well known members include buckwheat, sorrel (but not wood sorrel), rhubarb, and knotgrass. The family is named for the shape of the seed; that of rhubarb, for example, has a triangular cross-section. In the Cronquist system, the Polygonaceae were given their own order, but newer systems treat them as part of the Caryophyllales. The family is present worldwide in temperate regions, with rare species found in the Tropics.
Taxonomy There are 2 subfamilies: | |||||||||||||||||||||||||||||
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