Ornamental Jewelweed (Impatiens glandulifera)
Balsam family
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Plant Identification:Annual herb with thick, many-branched, hexagonally angled stems which can grow to 10 feet. Stems smooth, multi-branched, with large swollen glands at the nodes. Lower leaves opposite, while upper leaves are whorled with three leaves to a node. Leaves lance-shaped, 6 inches long, from a stout petiole. Leaf margins finely, sharply serrated. Irregular flowers one inch in length, pink-purple to white, with five petals.
Threat: Rapidly clogs wetlands and streams. Prolific seed production and aggressive spreader make for difficult control. Unwary gardeners have contributed to its spread into Alaska.
Found: Rare in Juneau, but has been found near Lena Beach and from 16-19 mile of Glacier Highway. Thrives in lowlands, riparian zones, and along beaches.
Distribution Map: Ornamental Jewelweed (Impatiens glandulifera) (External Link to EDDMapS website)
Detailed information sheet ( Link to .pdf at UAA ENRI Alaska Natural Heritage Program)