|P. polygaloides var. confertum |
Wall. ex Meisn.
Polygonum polygaloides is a North American species of flowering plants in the buckwheat family known by the common names milkwort knotweed and polygala knotweed. It is native to much of western North America, where it can be found in many types of moist habitat. It is a variable species, usually divided into a number of subspecies.
Polygonum polygaloides is an annual herb producing slender, wiry green stems 1 to 30 centimeters (0.4-12 inches) in length. The linear or lance-shaped leaves are alternately arranged uniformly along the stem, the ones near the tips of stem branches highly reduced. The leaves have membranous stipules which fuse to form silvery ochrea at the leaf bases. The flowers are mainly located in clusters around the stem tips. They are white, pink, or red, and most remain closed.
- Polygonum polygaloides subsp. confertiflorum (Nutt. ex Piper) J.C.Hickman - from British Columbia east to Saskatchewan and south as far as New Mexico
- Polygonum polygaloides subsp. esotericum (L.C. Wheeler) J.C. Hickman - California, Oregon
- Polygonum polygaloides subsp. kelloggii (Greene) J.C.Hickman - from British Columbia to Arizona
- Polygonum polygaloides subsp. polygaloides - Washington, Oregon, Idaho, Alberta, Montana, Wyoming
- photo of herbarium specimen at University of California, Berkeley, collected in Siskiyou County in 2005
- The Plant List, Polygonum polygaloides Meisn.
- Flora of North America, Polygonum polygaloides Meisner 1856. Polygala knotweed
- Biota of North America Program 2014 county distribution map, Polygonum kelloggii
- Biota of North America Program 2014 county distribution map, Polygonum polygaloides
- Jepson Manual Treatment, University of California - Polygonum polygaloides
- United States Department of Agriculture Plants Profile; Polygonum polygaloides
- Polygonum polygaloides - Calphotos Photo gallery, University of California
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