Cotyledons seedlings are elliptic to lanceolate in outline, with hairs along the margins. Learn more about Spotted Lady's Thumb. Leaves. The stems are usually light green, round, and glabrous or slightly pubescent. The list of references for all nonindigenous occurrences of Persicaria maculosa are found here. The Atlas of Florida Plants provides a source of information for the distribution of plants within the state and taxonomic information. Identification Notes. 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 maculosa (syn. The alternate … metabolites of both flowers and leaves of Persicaria hydropiper, Persicaria maculosa and Persicaria minor, three species which occur in the same habitat, were compared. introduced annual, reproducing by seed. Stems. Polygonum persicaria) is an annual plant in the buckwheat family, Polygonaceae.Common names include lady's thumb, spotted lady's thumb, Jesusplant, and redshank. 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. Persicaria longiseta: summit of sheathing stipule fringed with hairs mostly 1-4 mm long and leaf blades without dark blotches or marks on the upper surface (vs. P. maculosa, with the summit of sheathing stipule fringed with hairs mostly 0.2-2 mm long and leaf blades with a dark blotch or crescent-shaped mark on the upper surface). Persicaria maculosa. Found throughout North America, these native annuals produce thousands of hard-coated seeds. Identification: A summer annual weed of horticultural, agronomic, and nursery crops that may reach 3.5 feet in height. Life Cycle. The website also provides access to a database and images of herbarium specimens found at the University of South Florida and other herbaria. Using gas chromatography–mass spectrometry (GC–MS) analysis of extracts, overall 21/29 identified compounds in extracts were sesquiterpenoids and 5/29 were drimanes. Native to California CNPS rare plants Not native to California Affinity to serpentine soil Cal-IPC invasive plants Spotted Lady's Thumb (Persicaria maculosa) Posted by keithp2012. For many plants, the website displays maps showing physiographic provinces within the Carolinas and Georgia where the plant has been documented. 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. Persicaria maculosa, Spotted Lady's-thumb, Heart's-ease. NameThatPlant.net currently features 3816 plants and 23,855 images. 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