It is widespread across Eurasia from Iceland south to Portugal and east to Japan. Broad, oval, medium green leaves. NameThatPlant.net currently features 3816 plants and 23,855 images. The alternate … 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). Summary 9 Persicaria maculosa (syn. Foliage Leaves are elongate, narrow and pointed at the base and tip. Persicaria maculosa is an annual plant in the buckwheat family, Polygonaceae. Flowers 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. 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. Smartweed reaches 1-4 feet tall. 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. Invasive. Since they're all invasive, I don't really have to weed or water except in the Spring when other invasives come up. Persicaria maculosa. 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. Photo credit: (First) Alicyn Murphy, URI CE, (second, third, fourth) Randall G. … Stems are reddish. Persicaria maculosa, Spotted Lady's-thumb, Heart's-ease. 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. Ocrea have long, hair-like bristles on the margin. It typically forms a spreading foliage mound 2-3 feet tall and as wide or wider. 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). (15.2-76.2 cm) in height and can be either erect or sprawling. 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 have swollen nodes with papery sheaths (ocrea). For many plants, the website displays maps showing physiographic provinces within the Carolinas and Georgia where the plant has been documented. The stems are usually light green, round, and glabrous or slightly pubescent. It's quite lovely and virtually maintenance free. Read on for information about mile-a-minute weed … This all indicates widespread variation in the species. Are you worried about controlling mile-a-minute weeds in your backyard? Persicaria longiseta is an annual forb that can reach 6-30 in. Persicaria virginiana is a vigorous perennial native to Missouri. 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