UW Burke Herbarium species comparison

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Persicaria wallichii

garden knotweed, Himalayan knotweed
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.
Flowers

Inflorescence an open, terminal panicle;

flowers white, perfect; the 5 perianth segments obovate, 3-4 mm. long, not keeled.

Persicaria wallichii
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.
[WildflowerSearch map]
[BONAP county map]
Origin Introduced from eastern Asia
Conservation status Not of concern
Sibling taxa
P. amphibia, P. hydropiper, P. hydropiperoides, P. lapathifolia, P. maculosa, P. punctata
Subordinate taxa
P. wallichii var. wallichii
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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