Botanical name: Persicaria serrulata Family: Polygonaceae (Knotweed family)
Synonyms: Polygonum salicifolium, Persicaria salicifolia (Brouss. ex Willd.) Assenov (Illeg.)
Willowleaf Knotweed is a perennial herb characterized by weak stem, narrow leaves and slender flower-spikes. The plant is 1-4 ft tall. Leaves are lanceolate-linear, not glandular. Ocrea are up to 3.5 cm, with 6-12 long eyelashes. Stems lower nodes radicants. Flowers are white or rosy pink, borne in slender spikes. Fruit is a shiny black achene. Willowleaf Knotweed is native to S. Africa, probably naturalized in S. India.
Identification credit: Prashant Awale
The flower labeled Willowleaf Knotweed is ...