Polygonum parryi |
Polygonum fowleri |
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Parry's knotweed, prickly knotweed |
Fowler's knotweed |
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Habit | Very leafy annual or biennial, the stems prostrate or spreading, freely branched, 1-3 dm. long. | |
Leaves | Leaves alternate, usually overlapping, gradually reduced upward, the short petiole jointed; leaf blades elliptic-linear to elliptic-oblanceolate, rounded, 1.5-3 cm. long and 3-10 mm. wide, firm; stipules sheathing, lacerate, 3-6 mm. long. |
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Flowers | Flowers in closely packed, short, few-flowered, axillary racemes, exceeded by the bracts; pedicles 1-3 mm. long; the 5 perianth segments 3 mm. long, attached 1/3 their length, greenish with pink margins, oblong; styles 3, very short. |
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Polygonum parryi |
Polygonum fowleri |
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Identification notes | Achene 3-angled, lance-ovoid, olive green to yellowish-brown, smooth and shining. | |
Flowering time | June-July | July-November |
Habitat | Vernal pools, seasonally damp ground at low elevations. | Coastal salt marshes. |
Distribution | Occurring in the east end of the Columbia River Gorge in Washington; south-central Washington to California.
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Occurring west of the Cascades in Washington; Alaska south to California, east across northern Canada to northeastern North America.
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Origin | Native | Native |
Conservation status | Threatened in Washington (WANHP) | Not of concern |
Sibling taxa | ||
Subordinate taxa | ||
Web links |
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