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Himalayan knotweed (Polygonum polystachyum)

Images courtesy Glen Miller

EDRR Species?:

Description
Perennial, blooms July to October. Grows to 6 feet tall. Closely related to Giant and Japanese knotweeds. Leaves are lanceolate and 4 to 8 inches long, unlike Japanese and Giant knotweeds, which are ovate and cordate, respectively.

Impacts
This species is the least common of the three weedy knotweed species in the Pacific Northwest. Plants grow vigorously and create dense colonies that exclude native vegetation, but they are much shorter than related species and seem less adaptable to dense shade. Established populations are persistent and difficult to eradicate, due to their proximety to streams. It poses a significant threat to riparian areas, where it uses flood events for its dispersal by rapidly colonizing scoured shores and islands.