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Plant Identification: Annual which can grow to 4 ft tall. Flowers purple, pink, white, or pale yellow and grow in clusters at base of leaf stalks. Stems branched, bristly-haired, and square in cross section. Leaves opposite on stalks, egg-shaped to lance-shaped with large rounded teeth and pointed tips. Leaves prominently veined and covered with bristly hairs.
Threat: Forms dense stands on disturbed sites, forest edges, riparian areas, meadows, and beaches. Numerous seeds are small and easily spread on shoes, tires, and recreational equipment. Gardeners quickly come to despise this plant.
Found: Found in disturbed soils throughout Juneau.
Detailed information sheet ( Link to .pdf at UAA ENRI Alaska Natural Heritage Program)