Matricaria discoidea (Pineapple-weed)
|Also known as:||Disc Mayweed|
|Habitat:||part shade, sun; dry; road sides, waste areas|
|Bloom season:||May - September|
|Plant height:||3 to 12 inches|
|Wetland Indicator Status:||GP: FACU MW: FACU NCNE: FACU|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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Flowers are single at the tips of branching stems, yellowish green dome-shaped heads ¼ to 1/3 inch across. There are no petals (ray flowers), only disk flowers. The bracts surrounding the base of the flower head have a white papery edge.
Leaves and stem:
Leaves are up to 2 inches long and ¾ inch wide, deeply divided and branching into narrow, segments, looking feathery or fern-like. Leaves and stem both may have a few sparse hairs, but are mostly hairless.
Pineapple-weed may have originated in the Pacific Northwest or Asia; either way it is not considered native to Minnesota. It's a weedy thing often found in dry disturbed soil, and tends to form colonies. The common name reportedly comes from the pineapple-like smell of crushed leaves and flowers. It is likely far more widespread in the state than the distribution map indicates.
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Photos by K. Chayka taken in Ramsey County.
Have you seen this plant in Minnesota, or have any other comments about it?