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. Since they're all invasive, I don't really have to weed or water except in the Spring when other invasives come up. (15.2-76.2 cm) in height and can be either erect or sprawling. Persicaria maculosa, Spotted Lady's-thumb, Heart's-ease. A purplish thumbprint shape sometimes marks the leaf (see third image below). 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. Photo credit: (First) Alicyn Murphy, URI CE, (second, third, fourth) Randall G. … Ocrea have long, hair-like bristles on the margin. The alternate … 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. Stems are reddish. Broad, oval, medium green leaves. It is widespread across Eurasia from Iceland south to Portugal and east to Japan. Persicaria maculosa is an annual plant in the buckwheat family, Polygonaceae. 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). 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. Flowers Smartweed reaches 1-4 feet tall. 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. The stems are usually light green, round, and glabrous or slightly pubescent. It's quite lovely and virtually maintenance free. NameThatPlant.net currently features 3816 plants and 23,855 images. 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. 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. Found in a range of soil types. Are you worried about controlling mile-a-minute weeds in your backyard? 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. For many plants, the website displays maps showing physiographic provinces within the Carolinas and Georgia where the plant has been documented. Foliage Leaves are elongate, narrow and pointed at the base and tip. Read on for information about mile-a-minute weed … Persicaria longiseta is an annual forb that can reach 6-30 in. 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