Identification: A summer annual weed of horticultural, agronomic, and nursery crops that may reach 3.5 feet in height. Identification Notes. Found throughout North America, these native annuals produce thousands of hard-coated seeds. Redshank looks a lot like pale persicaria (P. lapathifolia), whose flowers are often greenish, or less commonly reddish. The list of references for all nonindigenous occurrences of Persicaria maculosa are found here. Learn more about Spotted Lady's Thumb. Persicaria maculosa. Polygonum persicaria) is an annual plant in the buckwheat family, Polygonaceae.Common names include lady's thumb, spotted lady's thumb, Jesusplant, and redshank. Persicaria maculosa (syn. It is widespread across Eurasia from Iceland south to Portugal and east to Japan. 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 The alternate … smooth, branching, swollen nodes, ocrea (papery or membranous sheath) at nodes, short stiff hairs on top margin of ocrea. The stems are usually light green, round, and glabrous or slightly pubescent. Cotyledons seedlings are elliptic to lanceolate in outline, with hairs along the margins. The website also provides access to a database and images of herbarium specimens found at the University of South Florida and other herbaria. View plant photos, descriptions, maps, treatment options, and more. 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. Leaves. 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 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. Spotted Lady's Thumb (Persicaria maculosa) Posted by keithp2012. Stems. 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). introduced annual, reproducing by seed. The Atlas of Florida Plants provides a source of information for the distribution of plants within the state and taxonomic information. Life Cycle. Polygonum persicaria L. syn. Persicaria maculosa, Spotted Lady's-thumb, Heart's-ease. NameThatPlant.net currently features 3816 plants and 23,855 images. 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