Appearance
"Persicaria longiseta" is an annual herb with stems 30 to 80 centimeters long, sometimes reaching one meter. The hairless, branching stems may root at lower nodes that come in contact with the substrate. The leaves are lance-shaped and up to 8 centimeters long by 3 cm wide. They have bristly ochrea. The inflorescence is an elongate cluster up to 8 centimeters long and contains many pink flowers. The fruit is a small, smooth achene.
Distribution
In its native region this plant is a common weed of rice paddies. It was introduced to North America near Philadelphia around 1910 and probably spread via the railroads. It is present in much of the eastern United States and much of Canada. It grows in moist habitat types such as wetlands, as well as dry and upland habitat. It can be found in meadows, marshes, mudflats, riverbanks, floodplains, levees, and lowland and upland forests. It is invasive in some areas.References:
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