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] Short-stalked flowers, usually single or sometimes paired, in the leaf axils on branching stems, 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 rounded at the tip and fused at the base into a short tube. Petals are pale lavender, purple or rose-pink with a darker mid-vein and textured like wrinkled tissue paper. The calyx holding the flower forms a narrow tube slightly longer than the petals, has strong parallel venation and 6 short, sharply pointed lobes that curve outward. Inside the tube are 6 purplish stamens and a single greenish style. 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 mid-stem leaves] Leaves are narrowly egg-shaped to oblong-elliptic, mostly rounded at the base and tapered to a point at the tip, toothless, hairless and stalkless. Lower leaves are up to 2 inches long and ½ inch wide, mostly opposite, becoming smaller, more oval-elliptic and mostly 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.

Fruit: Fruit type: capsule/pod

[photo of developing fruit] Fruit is a capsule that develops in the persistent calyx, containing numerous seeds.

[photo of seeds] Seeds are less than 1 mm long, narrowly lance-elliptic, pale straw-colored to golden brown.

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 by K. Chayka taken in Renville County. Photos by 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.

Posted by: Rhyan Schicker - SW Lac qui Parle county
on: 2019-08-07 15:39:57

Found this in an Ag field that has been converted to a CREP easement. Growing alongside Valley Redtsem (Lythraceae) in a muddy patch that had ponding due to wet springs. Have never come across it before- super cute plant!

Posted by: jim Lunde - GREEN BAY
on: 2020-08-09 17:00:08

I have some winged loosestrife that has shown up in my garden-should I keep it?

Posted by: K. Chayka
on: 2020-08-10 14:48:48

If this volunteered in my garden I'd surely keep it.

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