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Persicaria lapathifolia (syn. Polygonum lapathifolium), known as pale persicaria, [2] is a plant of the family Polygonaceae. It is considered to be native throughout most of the world, from arctic to tropical realms, except South America and Southern Africa. [ 3 ]
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 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.
Persicaria is a genus of herbaceous flowering plants in the knotweed family, Polygonaceae. Plants of the genus are known commonly as knotweeds [2]: 436 or smartweeds. [3] It has a cosmopolitan distribution, with species occurring nearly worldwide. [3] [4] The genus was segregated from Polygonum. [5]
Polygonum polygaloides is a North American species of flowering plants in the buckwheat family known by the common names milkwort knotweed and polygala knotweed. It is native to much of western North America, where it can be found in many types of moist habitat. It is a variable species, usually divided into a number of subspecies.
This plant may look like wildflowers, but it can cause painful rash and blistering. A video of an Iowa resident with the rash explains why.
Stems may be pale green to red in color. The leaves are oval and pointed or widely-lance-shaped to somewhat triangular, yellowish or pale green and waxy, slightly hairy, or smooth in texture. Leaf edges are entire or minutely toothed. At the base of each leaf is a thin reddish sheath formed from the leaf's stipules which is known as the ochrea. [4]
Many species of insects feed on knotgrass, including the eponymous Knot Grass moth, Acronicta rumicis, whose larvae are phytophagous on the leaves. The UK's Database of Insects and their Food Plants lists 113 species which are known to feed on this plant in Britain, of which 10 are beetles , 2 are flies , 8 are Hemiptera (bugs and aphids), and ...