Polygonum polystachyum

Published in Wall. ex Meisn. (1832). In: Wall., Pl. Asiat. Rar. 3: 61.

Koenigia polystachya is a species of flowering plant in the knotweed family, known by the common names Himalayan knotweed and cultivated knotweed. It has several regularly used synonyms, including Polygonum polystachyum, Aconogonon polystachyum and Persicaria wallichii.

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