Himalayan knotweed, Kashmir plume

Polygonum polystachyum Wallich ex Meisner in N. Wallich, Pl. Asiat. Rar. 3: 61. 1832, not Persicaria polystachya Opiz 1852; Aconogonon polystachyum (Wallich ex Meisner) M. Král; Pleuropteropyrum polystachyum (Wallich ex Meisner) Munshi & G. N. Javied; Reynoutria polystachya (Wallich ex Meisner) Moldenke; Rubrivena polystachya (Wallich ex Meisner) M. Král

Varieties 2 (1 in the flora): introduced; Asia.

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.