Checklist » Polygonaceae » Persicaria wallichii
Last updated 3/24/2009 by David Giblin.
Persicaria wallichii Greuter & Burdet[FNA5, HC2]
Himalayan knotweed

Publication: Willdenowia. 19: 41. 1989.

Origin: Introduced from eastern Asia

selected vouchers: WTU

Notes: Recently collected in Grays Harbor, King, and Wahkiakum Cos.

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."

References: (none)

Infraspecies:

var. wallichii [FNA5, HC2]
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