Koenigia phytolaccifolia (synonym Aconogonon phytolaccifolium) is a species of flowering plant in the knotweed family, known by the common name poke knotweed.
Description Koenigia phytolaccifolia is a perennial herb up to tall. The lance-shaped or pointed oval leaves are 10 to 20 centimeters long and borne on petioles. The leaves have large stipules which form reddish ochrea up to long. The inflorescence is a long array of branching cluster of many white or greenish flowers. Each flower is about wide and has tiny protruding stamens tipped with yellow or pink anthers.Flora of North America, Aconogonon phytolaccifolium (Meisner ex Small) Small 1917 Poke knotweed
Distribution Koenigia phytolaccifolia is native to the western United States: California, Oregon, Washington, Nevada, Idaho, and Montana.Biota of North America Program 2014 county distribution mapCalflora taxon report, University of California, Aconogonon phytolaccifolium (Meisn. ex Small) Small ex Rydb., Davis knotweed Turner Photographics, Wildflowers of the Pacific Northwest, Polygonum phytolaccifolium Alpine Knotweed photos, description, partial distribution map
References
External links SEINet, Southwestern Biodiversity, Arizona Chapter photos of herbarium specimens