View plant photos, descriptions, maps, treatment options, and more. Stems. The website also provides access to a database and images of herbarium specimens found at the University of South Florida and other herbaria. 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 (syn. Identification: A summer annual weed of horticultural, agronomic, and nursery crops that may reach 3.5 feet in height. 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. For many plants, the website displays maps showing physiographic provinces within the Carolinas and Georgia where the plant has been documented. Cotyledons seedlings are elliptic to lanceolate in outline, with hairs along the margins. Polygonum persicaria L. syn. The list of references for all nonindigenous occurrences of Persicaria maculosa are found here. 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). Life Cycle. 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. Identification Notes. Using gas chromatography–mass spectrometry (GC–MS) analysis of extracts, overall 21/29 identified compounds in extracts were sesquiterpenoids and 5/29 were drimanes. Redshank looks a lot like pale persicaria (P. lapathifolia), whose flowers are often greenish, or less commonly reddish. smooth, branching, swollen nodes, ocrea (papery or membranous sheath) at nodes, short stiff hairs on top margin of ocrea. Spotted Lady's Thumb (Persicaria maculosa) Posted by keithp2012. It is widespread across Eurasia from Iceland south to Portugal and east to Japan. Leaves. 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. introduced annual, reproducing by seed. Persicaria maculosa, Spotted Lady's-thumb, Heart's-ease. Native to California CNPS rare plants Not native to California Affinity to serpentine soil Cal-IPC invasive plants The stems are usually light green, round, and glabrous or slightly pubescent. Polygonum persicaria) is an annual plant in the buckwheat family, Polygonaceae.Common names include lady's thumb, spotted lady's thumb, Jesusplant, and redshank. 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