species 124 observations

Small's Knotweed

Polygonum buxiforme

Field notes

Polygonum aviculare or common knotgrass is a plant related to buckwheat and dock. It is also called prostrate knotweed, birdweed, pigweed and lowgrass. It is an annual found in fields and wasteland, with white flowers from June to October. It is widespread across many countries in temperate regions, apparently native to Eurasia, naturalized in temperate parts of the Southern Hemisphere.

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84 native animals
supported in the US

Range

United States

Greener is more native, amber more introduced; paler is less certain. How this was decided

Key traits

From USDA PLANTS.