Persicaria maculosa (syn. Polygonum persicaria)
This species has fibrous roots with a shallow taproot. Stems are branched, often reddish in color and swollen at the nodes. A thin membranous sheath called an ocrea encircles the stem at the base of each leaf petiole. The ocreas of ladysthumb have stiff hairs arising from the top of the ocrea, which are approximately 2 mm long.
Flowers are clustered in terminal spikes at the ends of stems. Individual flowers are small and usually pink in color, but can occasionally be white.
Fruit is a black achene. Table 1. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Persicaria maculosa are found here. Polygonum persicaria has a high socioeconomic impact in the Great Lakes. The economic impact of P. Holm et al. Polygonum persicaria has a moderate Persicaria maculosa prostatite impact in the Great Lakes.
This plant is a source of persicarin which is viewed as Persicaria maculosa prostatite candidate therapeutic for the treatment of severe vascular inflammatory diseases, such as sepsis or septic shock Kim et Persicaria maculosa prostatite Its leaves and young Persicaria maculosa prostatite may be eaten, but Persicaria maculosa prostatite plant is not grown commercially for this purpose.
Polygonum persicaria seeds are important food sources for many birds and mammals, including gamebirds, waterfowl, and deer DiTomaso and Healy Biological Although Persicaria maculosa prostatite. No arthropods known to attack this species specifically have been Persicaria maculosa prostatite Plantwise Physical When handling smartweed, do not place hands close to eyes — it contains a chemical which burns.
Management of this species in agricultural settings focuses on elimination of seed as a contaminant Persicaria maculosa prostatite cultivation to prevent seedling establishment.
Tillage Persicaria maculosa prostatite cultivation which disrupts seedlings can be effective. Repeated mowing to prevent seed production can also reduce populations over time Plantwise Chemical P. Pre-emergent herbicides, especially with the chemical Dichlobenil, are effective. Use on-going for up to one year. Systemic herbicides to kill the fibrous roots can also work well. Products containing dicamba work best over others containing 2,4-D and glyphosate Easy Butterfly Garden Follow all label instructions.
Cell Physiol. Persicaria maculosa prostatite Plants Database. Polygonum persicaria. Rawat, SK. Remediation of nitrite contamination in ground Persicaria maculosa prostatite surface waters using aquatic macrophytes.
J Environ. Persicaria maculosa. State Rd. Persicaria maculosa Gray Common Name: Spotted ladysthumb. Synonyms and Other Names: Polygonum persicarialady's thumb, redshank, smartweed, Jesusplant.
Robert H. Western wetland flora: Field office guide to plant species. West Region, Sacramento, CA. Identification: A summer annual weed of horticultural, agronomic, and nursery crops that may reach 3.
Cotyledons seedlings are elliptic to lanceolate in outline, with hairs along the margins. First true leaves are alternate, lanceolate in outline, and hairy on the upper surfaces. Older leaves are usually only slightly hairy. Leaves taper to short petioles, which have an ocrea that encircles the stem.
Leaves often, but not always, have a purple spot in the middle of the leaf which resembles the mark of a lady's thumb, thus the name of this weed. Size: 3. Click here for Great Lakes region Persicaria maculosa prostatite information. The marsh plant is found throughout the Great Lakes basin in a variety of habitats DayDudleyWiegand and EamesZenkertFassettMontgomerySwink and WilhelmSoper et al and was considered widespread in the basin by Ecology: This species prefers moist to wet waste ground, disturbed sites, meadows, stream banks, roadsides, and railroads.
It likes acid peaty loam and does not tolerate alkaline soil. It flowers from May to October. Means of Introduction: Unknown.
Status: Established and naturalized in all mainland states. Great Lakes Impacts: Current research on the environmental Persicaria maculosa prostatite of Polygonum persicaria in the Great Lakes is inadequate to support proper assessment. Polygonum persicaria competes with natural vegetation, particularly in moist areas along ditches, streams, rivers, and marshes. Stands can slow water flow in canals and streams DiTomaso and Healy Several Polygonum species are native to the Great Lakes region, but information on potential hybridization is not readily available.
Management: Regulations pertaining to the Great Lakes region There are no known regulations for this species. Control Biological Although P. Solarizing black plastic will kill seeds, as will burning and acetic acid. Remarks: Pennsylvania smartweed Polygonum pensylvanicum is very similar in appearance and growth habit, but does not have hairs on the ocrea like that of ladysthumb.
Tufted knotweed Polygonum caespitosum var. Synonyms include Persicaria maculosa prostatite. Author: Cao, L. Contributing Agencies:. This information is preliminary or provisional and is subject to revision. It Persicaria maculosa prostatite being provided to Persicaria maculosa prostatite the need for timely best science.
The information has not received final approval by the U. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information. This map only depicts Great Lakes introductions. Little Calumet-Galien ; St. Clair ; St. Clair-Detroit ; St. New York. Lake Erie.