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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 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 argyrocoleon, with common names silver-sheath knotweed [3] and Persian knotweed, is an Asian species of plants in the buckwheat family. It is native to Siberia, western China, Central Asia, and the Middle East. [4] It has also become naturalized in parts of the United States, primarily the Southwest, and northwestern Mexico. [5] [6]
Highs top 110 °F (43 °C) an average of 21 days during the year. [6] On June 26, 1990, the temperature reached an all-time recorded high of 122 °F (50 °C). [7] In 2024, Phoenix-Mesa, AZ, was ranked fifth for most ozone pollution in the United States according to the American Lung Association. [8]
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.
The Polygonaceae are a family of flowering plants known informally as the knotweed family or smartweed—buckwheat family in the United States. The name is based on the genus Polygonum , and was first used by Antoine Laurent de Jussieu in 1789 in his book, Genera Plantarum . [ 2 ]
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