Identification: A summer annual weed of horticultural, agronomic, and nursery crops that may reach 3.5 feet in height. metabolites of both flowers and leaves of Persicaria hydropiper, Persicaria maculosa and Persicaria minor, three species which occur in the same habitat, were compared. The Atlas of Florida Plants provides a source of information for the distribution of plants within the state and taxonomic information. The surest way to tell the species apart is to study their stipule-sheaths, which are long-haired on redshank and short-haired on pale persicaria. Polygonum persicaria) is an annual plant in the buckwheat family, Polygonaceae.Common names include lady's thumb, spotted lady's thumb, Jesusplant, and redshank. View plant photos, descriptions, maps, treatment options, and more. Cotyledons seedlings are elliptic to lanceolate in outline, with hairs along the margins. For many plants, the website displays maps showing physiographic provinces within the Carolinas and Georgia where the plant has been documented. NameThatPlant.net currently features 3816 plants and 23,855 images. It is widespread across Eurasia from Iceland south to Portugal and east to Japan. introduced annual, reproducing by seed. Native to California CNPS rare plants Not native to California Affinity to serpentine soil Cal-IPC invasive plants Stems. Using gas chromatography–mass spectrometry (GC–MS) analysis of extracts, overall 21/29 identified compounds in extracts were sesquiterpenoids and 5/29 were drimanes. The alternate … 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. Redshank looks a lot like pale persicaria (P. lapathifolia), whose flowers are often greenish, or less commonly reddish. Spotted Lady's Thumb (Persicaria maculosa) Posted by keithp2012. Leaves. Persicaria maculosa (syn. Life Cycle. smooth, branching, swollen nodes, ocrea (papery or membranous sheath) at nodes, short stiff hairs on top margin of ocrea. The website also provides access to a database and images of herbarium specimens found at the University of South Florida and other herbaria. Learn more about Spotted Lady's Thumb. Identification Notes. Persicaria maculosa, Spotted Lady's-thumb, Heart's-ease. The stems are usually light green, round, and glabrous or slightly pubescent. Smartweed (Polygonum pensylvanicum) and closely related lady's thumb (P. persicaria) are a shade gardener's worst nightmare, because they grow best in moist partial shade. Polygonum persicaria L. syn. Persicaria maculosa. Found throughout North America, these native annuals produce thousands of hard-coated seeds. The list of references for all nonindigenous occurrences of Persicaria maculosa are found here. 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