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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.
Polygonum arenastrum, commonly known as equal-leaved knotgrass, [2] is a summer annual flowering plant in the knotweed family Polygonaceae.Other common names include common knotweed, prostrate knotweed, mat grass, oval-leaf knotweed, [3] stone grass, wiregrass, and door weed, as well as many others.
Polygonum is a genus of about 130 species of flowering plants in the buckwheat and knotweed family Polygonaceae. Common names include knotweed and knotgrass (though the common names may refer more broadly to plants from Polygonaceae). In the Middle English glossary of herbs Alphita (c. 1400–1425), it was known as ars-smerte.
Polygonum paronychia is a species of flowering plant in the knotweed family known by the common names dune knotweed, black knotweed, and beach knotweed. [1] It is native to the coastline of western North America from British Columbia to California, where it grows in sandy coastal habitat such as beaches, dunes, and scrub.
Polygonum fowleri, commonly called Fowler's knotweed or Hudsonian knotweed, is a plant species native to the seashores of the northern part of North America.It has been reported from every Canadian province and territory except Alberta and Saskatchewan, as well as from Maine, Alaska, Washington, Oregon, California, and St. Pierre & Miquelon.
Polygonum ramosissimum has erect stems growing 30 to 100 cm (12 to 39.5 in) (sometimes to 200 cm or 80 inches) tall, with yellowish-green to blue-green foliage. The stems are freely branched with closed flowers produced in groups of (1) 2 to 3(5) flowers in the upper ocreae of racemes that are up to 15 cm (6 in) long, the inflorescences are spike-like.
Polygonum minimum is a species of flowering plant in the knotweed family known by the common name broadleaf knotweed. It is native to much of western North America where it can be found in mountainous regions. It grows in the subalpine and alpine climates of high mountain ranges from Alaska to Arizona and New Mexico. [2]
Polygonum shastense is a species of flowering plant in the knotweed family known by the common name Shasta knotweed.It is native to sections of southwestern Oregon, northwestern Nevada, and northern and central California, [1] where it grows in rocky and gravelly mountainous habitat up to 3300 meters (11,000 feet) elevation. [2]