Lythrum alatum (Winged Loosestrife)

Plant Info
Also known as: Wing-angled Loosestrife, Winged Lythrum
Genus:Lythrum
Family:Lythraceae (Loosestrife)
Life cycle:perennial
Origin:native
Habitat:part shade, sun; along shores, wet meadows, wet prairies
Bloom season:June - September
Plant height:1 to 4 feet
Wetland Indicator Status:GP: OBL MW: OBL NCNE: OBL
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

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Detailed Information

Flower: Flower shape: 6-petals Cluster type: raceme

[photo of flowers] Single flowers on short stalks blooming from each leaf axil, typically 2 to 5 blooming at a time in a cluster slowly ascending the branch as newer buds mature. Individual flowers are ¼ to ½ inch across with 6 petals, pale lavender, purple or rose-pink with a darker mid-vein, rounded at the tip and fused at the base into a short tube, forming an off-white throat. Petals are textured like wrinkled tissue paper. The calyx holding the flower forms a narrow tube and has strong parallel veination and 6 sharp tips curved outward. 6 purplish brown stamens extend out of the throat with the single greenish style hidden inside the tube. A plant has several racemes on erect branching stems in the upper part of the plant.

Leaves and stems: Leaf attachment: alternate Leaf attachment: opposite Leaf type: simple

[photo of leaves] Leaves are elliptical to lance-shaped, rounded at the base and tapered to a point at the tip, toothless and hairless with no leaf stalk. Lower leaves are up to 2 inches long and ½ inch wide, more lance-like and opposite, becoming smaller, more oval and alternate in upper portions of the plant. Stems are 4-sided, have slightly raised ridges or wings that run parallel the length of the stems, and are hairless.

Notes:

Winged Loosestrife is the native next of kin to the widely invasive and destructive Purple Loosestrife, Lythrum salicaria that was introduced by gardeners via the global nursery industry and is now ranked among the most highly problematic invasive species in North America. While perhaps L. alatum was once more widely encountered than it is now, much of its habitat is highly vulnerable to invasion by its cousin as well as problem plants like Reed Canary Grass, which easily displace it and everything else. Where Winged Loosestrife does persist it is unlikely to be confused with Purple Loosestrife, as it behaves itself and does not have the dense flower spikes of its cousin, and for those reasons it is not always easy to pick out of the landscape.

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More photos

Photos courtesy Peter M. Dziuk taken in Dodge County

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: V. Lee - Lebanon Hills Park, Schulze lake center
on: 2011-08-14 19:31:13

Saw these along the sidewalk near the visitors entrance. couldn't find them in any of my reference books. thanks to you, the problem is solved! Love your site.

Posted by: DALE - MINNEAPOLIS
on: 2014-08-15 09:16:33

Found still blooming on Aug 10 at Iron Horse prairie SNA

Posted by: Ruth and Jim - Root River Bottoms in Houston County, east of Hwy. 26
on: 2016-07-14 11:52:13

Several scattered patches were found in a former agriculture field that is converting to wet meadow. Reed canary grass is present and expanding.

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