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