Hibiscus trionum (Flower of an Hour)
|Also known as:|
|Habitat:||sun; fields, roadsides, waste areas|
|Bloom season:||July - September|
|Plant height:||4 to 24 inches|
|Wetland Indicator Status:||none|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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Flowers are 2 to 2½ inches across with 5 round, overlapping pale yellow petals, deep purple at the base. In the center are many bright orange tipped stamens and a stigma rising up in the center with 5 deep red, fuzzy round branches at the tip. Behind the flower are 5 translucient sepals, starkly veined with stiff hairs on vein ridges. Up to 12 narrow, spreading, hairy bracts sit below. Flowers arise on hairy stalks from leaf axils in the upper part of the plant
Leaves and stem:
Leaves are up to 3 inches long and 2 inches wide, palmately compound mostly in 3's, each leaflet with rounded lobes and the end leaflet largest. Stems are branched at base, sparsely wooly, semi-erect or sprawling.
The sepals persist and enclose a 5-sectioned capsule containing brownish black, kidney-shaped seeds.
Flower of an Hour is an increasing field/garden/roadside pest in Minnesota, the flowers are quite beautiful, lasting only briefly in the day. It was once considered a county-level noxious weed and agricultural pest, but Round-up Ready crops took care of that.
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Photos courtesy Peter M. Dziuk, taken in cultivated fields in Anoka and Dakota Counties
Have you seen this plant in Minnesota, or have any other comments about it?