Blooms: June-September
Habit: herb
Duration: annual
Origin: Native
Conservation Status: Abundant; of no concern.
Distribution: Widely distributed throughout most of Washington; British Columbia south to California, east to the Rocky Mountains and across northern U.S./southern Canada to the Atlantic Coast.
Habitat: Common in dry to moist areas, lowlands to mid-elevations in the mountains.
Habit: herb
Duration: annual
Origin: Native
Conservation Status: Abundant; of no concern.
Distribution: Widely distributed throughout most of Washington; British Columbia south to California, east to the Rocky Mountains and across northern U.S./southern Canada to the Atlantic Coast.
Habitat: Common in dry to moist areas, lowlands to mid-elevations in the mountains.
Species Description:
General: A highly variable, simple or freely-branched, erect annual 1-4 dm. tall.
Leaves: Alternate and numerous along the stem, linear to oblong, lanceolate or even ovate, 1-5 cm. long, sessile, jointed at the base, reduced to bracts above; stipules sheathing, 5-15 mm. long, lacerate.
Flowers: In loose, elongate racemes and in the leaf axils, 1-4 flowers per node, on pedicles 1-4 mm. long, soon reflexed; perianth 2.5-5 mm. long, the segments greenish with white, pink or reddish margins; stamens 8, occasionally fewer.
Fruits: Achene with three sharp angles, black, smooth and shining, about 3 mm. long.
Distinguishing Characteristics: Five taxa that were once considered as separate species are now regarded as varieties of P. douglasii (P. austiniae, P. majus, P. nuttallii, P. sawatchense and P. spergulariforme).
General: A highly variable, simple or freely-branched, erect annual 1-4 dm. tall.
Leaves: Alternate and numerous along the stem, linear to oblong, lanceolate or even ovate, 1-5 cm. long, sessile, jointed at the base, reduced to bracts above; stipules sheathing, 5-15 mm. long, lacerate.
Flowers: In loose, elongate racemes and in the leaf axils, 1-4 flowers per node, on pedicles 1-4 mm. long, soon reflexed; perianth 2.5-5 mm. long, the segments greenish with white, pink or reddish margins; stamens 8, occasionally fewer.
Fruits: Achene with three sharp angles, black, smooth and shining, about 3 mm. long.
Distinguishing Characteristics: Five taxa that were once considered as separate species are now regarded as varieties of P. douglasii (P. austiniae, P. majus, P. nuttallii, P. sawatchense and P. spergulariforme).
Accepted Name:
Polygonum douglasii GreeneSynonyms:
Polygonum douglasii Greene ssp. douglasii
Polygonum douglasii Greene var. douglasii
Polygonum douglasii Greene var. latifolium (Engelm.) Greene
Treated in Flora of the PNW as:
Polygonum douglasii
Additional Resources:
PNW Herbaria Specimens: View list of Polygonum douglasii specimens in the Consortium of Pacific Northwest Herbaria database.
WTU Herbarium Specimens: View list of Polygonum douglasii specimens in the WTU Herbarium database.
Washington Flora Checklist: Polygonum douglasii treatment.
E-Flora BC: Polygonum douglasii atlas page.
CalPhotos: Polygonum douglasii images.
USDA Plants Database: Polygonum douglasii.
G. D. Carr, 2007
G. D. Carr, 2007
G. D. Carr, 2007
G. D. Carr, 2007
G. D. Carr, 2007
G. D. Carr, 2009
G. D. Carr, 2009
G. D. Carr, 2009
Craig Althen, 2010
Craig Althen, 2010
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 WA Native Plant Society |
