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. Nepal knotweed is found in the Himalayas, from Pakistan east to China and Japan, Malaysia, at altitudes of 1200-4100 m. It is also found in Tropical Africa, Afghanistan.

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The flower labeled Nepal Knotweed is ...