Persicaria wallichii |
Persicaria hirsuta |
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garden knotweed, Himalayan knotweed |
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Habit | Vigorous, rhizomatous perennial with numerous, erect, reddish-brown, leafy, branching stems 1.5-2 m. tall. | |
Leaves | Leaves alternate, the lower petiolate, becoming subsessile upward; leaf blade oblong-lanceolate to ovate-lanceolate, acuminate, up to 20 cm. long, the base truncate to cordate; stipules sheathing, not lacerate. |
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Flowers | Inflorescence an open, terminal panicle; flowers white, perfect; the 5 perianth segments obovate, 3-4 mm. long, not keeled. |
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Persicaria wallichii |
Persicaria hirsuta |
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Identification notes | Achene 3-angled, black, smooth and shining, 3 mm. long. | |
Flowering time | July-October | |
Habitat | Waste areas, roadsides, and other disturbed areas where often where somewhat moist. | |
Distribution | Occurring west of the Cascades crest in Washington; British Columbia to California; also in eastern North America.
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Origin | Introduced from eastern Asia | |
Conservation status | Not of concern | |
Sibling taxa | ||
Subordinate taxa | ||
Web links |
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