metabolites of both flowers and leaves of Persicaria hydropiper, Persicaria maculosa and Persicaria minor, three species which occur in the same habitat, were compared. 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. Cotyledons seedlings are elliptic to lanceolate in outline, with hairs along the margins. Using gas chromatography–mass spectrometry (GC–MS) analysis of extracts, overall 21/29 identified compounds in extracts were sesquiterpenoids and 5/29 were drimanes. Identification: A summer annual weed of horticultural, agronomic, and nursery crops that may reach 3.5 feet in height. introduced annual, reproducing by seed. Polygonum persicaria L. syn. Persicaria maculosa. The stems are usually light green, round, and glabrous or slightly pubescent. 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). Learn more about Spotted Lady's Thumb. 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. NameThatPlant.net currently features 3816 plants and 23,855 images. Life Cycle. 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. The Atlas of Florida Plants provides a source of information for the distribution of plants within the state and taxonomic information. For many plants, the website displays maps showing physiographic provinces within the Carolinas and Georgia where the plant has been documented. View plant photos, descriptions, maps, treatment options, and more. 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. It is widespread across Eurasia from Iceland south to Portugal and east to Japan. Identification Notes. Persicaria maculosa, Spotted Lady's-thumb, Heart's-ease. Found throughout North America, these native annuals produce thousands of hard-coated seeds. Persicaria maculosa (syn. Stems. 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