NameThatPlant.net currently features 3816 plants and 23,855 images. Stems have swollen nodes with papery sheaths (ocrea). Found in a range of soil types. Persicaria virginiana is a vigorous perennial native to Missouri. Persicaria maculosa, Spotted Lady's-thumb, Heart's-ease. Since they're all invasive, I don't really have to weed or water except in the Spring when other invasives come up. Tiny, white to greenish-white, beady, jumpseed-like flowers on long, slender, wand-like stems appear in mid to late summer, but are not particularly showy. The state of Minnesota in the USA has declared P. persicaria as a secondary noxious weed and several states have categorized it as invasive (USDA-NRCS, 2002). Read on for information about mile-a-minute weed … Summary 9 Persicaria maculosa (syn. Persicaria longiseta is an annual forb that can reach 6-30 in. Persicaria maculosa is an annual plant in the buckwheat family, Polygonaceae. It is also present as an introduced and invasive species in North America, where it was first noted in the Great Lakes region in 1843 and has now spread through most of the continent. (15.2-76.2 cm) in height and can be either erect or sprawling. The stems are usually light green, round, and glabrous or slightly pubescent. It typically forms a spreading foliage mound 2-3 feet tall and as wide or wider. A purplish thumbprint shape sometimes marks the leaf (see third image below). Flowers It is widespread across Eurasia from Iceland south to Portugal and east to Japan. Photo credit: (First) Alicyn Murphy, URI CE, (second, third, fourth) Randall G. … Foliage Leaves are elongate, narrow and pointed at the base and tip. Ocrea have long, hair-like bristles on the margin. Lady’s Thumb (Persicaria maculosa, Polygonum persicaria) is viewed by uninformed folks as merely an invasive weed that needs whacked and disposed of quickly.But, to homesteaders and fans of wild edibles in general, discovering this plant on your land can provide a natural bounty of home remedy ingredients. For many plants, the website displays maps showing physiographic provinces within the Carolinas and Georgia where the plant has been documented. My groundcover is a mixture of persicaria maculosa threaded through violets with a few punctuations of spiderwort, pokeweed, persicaria odorata and morning glory up the fences. Stems are reddish. Persicaria maculosa Knotweed family (Polygonaceae) Description: This plant is a summer annual that is ½–2' tall and more or less erect, although individual plants may sprawl. Like P. maculosa, P. pensylvanica also has shorter and more erect racemes but those of P. maculosa are typically a bit shorter and more slender. Persicaria perfoliata (mile-a-minute) Phellodendron amurense (amur cork tree) Populus alba (white cottonwood) Robinia pseudoacacia (black locust) Rosa multiflora Multiflora Rose; One factor that makes plants more likely to become invasive is their ability to self-fertilize. Persicaria maculosa. This all indicates widespread variation in the species. Smartweed reaches 1-4 feet tall. Are you worried about controlling mile-a-minute weeds in your backyard? Broad, oval, medium green leaves. The alternate … It's quite lovely and virtually maintenance free. Invasive. Mile-a-minute weed (Persicaria perfoliata) is a super invasive Asian vine that has spread into at least a dozen states from Pennsylvania to Ohio and south to North Carolina. Many Polygonum species, including P. persicaria, are now placed by a number of authorities in the genus Persicaria, hence Stace (1991) uses the synonym Persicaria maculosa and Grierson and Long (1983) use Persicaria dolichopoda. 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