Broad, oval, medium green leaves. Are you worried about controlling mile-a-minute weeds in your backyard? The stems are usually light green, round, and glabrous or slightly pubescent. Summary 9 Persicaria maculosa (syn. NameThatPlant.net currently features 3816 plants and 23,855 images. Photo credit: (First) Alicyn Murphy, URI CE, (second, third, fourth) Randall G. … Ocrea have long, hair-like bristles on the margin. Foliage Leaves are elongate, narrow and pointed at the base and tip. Stems have swollen nodes with papery sheaths (ocrea). 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. 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. A purplish thumbprint shape sometimes marks the leaf (see third image below). Persicaria longiseta is an annual forb that can reach 6-30 in. 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). 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. Smartweed reaches 1-4 feet tall. 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. It typically forms a spreading foliage mound 2-3 feet tall and as wide or wider. 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. Found in a range of soil types. Polygonum persicaria) is an annual plant in the knotweed family, Polygonaceae.Common names include lady's thumb,spotted lady's thumb, Jesusplant, and redshank.It is native to Eurasia and present as an introduced and invasive species in North America, where it was first noted in the Great Lakes region in 1843. 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. Stems are reddish. 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. Read on for information about mile-a-minute weed … Also, the ocrea of P. maculosa has observable bristles or cilia fringe on the upper edge where the other two are usually fringeless, and P. maculosa will often have only 4 tepals and P. pensylvanica has 5. Persicaria maculosa is an annual plant in the buckwheat family, Polygonaceae. For many plants, the website displays maps showing physiographic provinces within the Carolinas and Georgia where the plant has been documented. Flowers Persicaria virginiana is a vigorous perennial native to Missouri. Invasive. This all indicates widespread variation in the species. It is widespread across Eurasia from Iceland south to Portugal and east to Japan. Since they're all invasive, I don't really have to weed or water except in the Spring when other invasives come up. 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. 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