Willowleaf Knotweed
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Willowleaf Knotweed
aturalized Photo: Prashant Awale
Common name: Willowleaf Knotweed, Willow-Leaved Knotgrass
Botanical name: Persicaria salicifolia subsp. salicifolia    Family: Polygonaceae (Knotweed family)
Synonyms: Persicaria serrulata, Polygonum salicifolium

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 India.

Identification credit: Prashant Awale Photographed in Karnataka.

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