Washington Flora Checklist

A Checklist of the Vascular Plants of Washington State
Hosted by the University of Washington Herbarium, Burke Museum

Checklist » Polygonaceae » Persicaria wallichii

Persicaria wallichii Greuter & Burdet[FNA5, HC2]

garden knotweed

Publication: Willdenowia. 19: 41. 1989.

Origin: Introduced from eastern Asia

Herbarium search: CPNWH

Notes: FNA5: "Persicaria wallichii is an ornamental that escapes infrequently in the flora area. A population in Nova Scotia apparently was ephemeral. Plants with leaf blades sparsely to densely pubescent abaxially and pedicels glabrous are var. wallichii, to which naturalized North American plants appear to be referable. Plants with leaf blades brownish-tomentose abaxially and pedicels usually pubescent are var. tomentosa S. P. Hong, which may be in cultivation in North America."

Infraspecies:

var. wallichii [FNA5, HC2]

garden knotweed, Himalayan knotweed

Last updated 2/12/2024 by David Giblin.

Photo © 2011 Ben Legler
(from WTU Image Collection)

Synonyms & Misapplied Names:

Aconogonon polystachyum (Wall. ex Meisn.) M. Král

Pleuropteropyrum polystachyum (Wall. ex Meisn.) Munshi & G.N. Javied

Polygonum polystachyum Wall. ex Meisn.[HC]

Reynoutria polystachya (Wall. ex Meisn.) Moldenke

Rubrivena polystachya (Wall. ex Meisn.) M. Král