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Etymology: Polygonum: derived from the Greek words polys, "many," and gonu, "knee or joint," hence "many joints" because of the thickened joints on the stem
Plants: erect or sprawling, annual, 12"-40" tall forb; stems with several branches Leaves: alternate, narrow, flat, leaves on branches much smaller than those on the stem, jointed at the base Flowers: greenish, 5-parted, 1/8" long, with a deep cleft, petals and petal-like sepals joined at the base with the outer 3 longer than the inner 2; inflorescence with 1-3 flowers in erect clusters from the upper nodes Fruits: blackish, smooth, shiny, dry, oval, 3-angled seed Habitat: moist; shores Conservation Status: Native |
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© Wisconsin State Herbarium, UW-Madison
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