Botanical name: Persicaria nepalensis Family: Polygonaceae (Knotweed family)
Synonyms: Polygonum nepalense
The name polygonum is probably derived from the Greek poly, "many" and gonu, "knot". Nepal Persicaria is an ascending-erect, 20-30 cm high, hairy, annual herb. Stems can be simple or branched. Leaves 1.8-5 x 0.5-3 cm, lower ones often rhomboid with a roundish base, upper ones can be with or without a leaf stalk. Inflorescences are terminal corymbs (clusters) 6-7 mm in diameter, with a lone leaf partly wrapped around it. Tiny flowers 2.0-2.5 mm across are light pink-blue.
The flower labeled Nepal Knotweed is ...