P. barbata has a cylindrical stem, dark green or red in color, has petiole-like borders forming internodes that allow aerial roots to grow to form separate shoots.
The leaves sit opposite, elongated, slender base, pointed tip, white hair, green upper surface with dark V-shaped markings, a large vein in the middle with many small pinnate veins.
Small flowers in panicles, white, growing in rows on long stalks at the end of the stem, erect and blooming all season. Smartweed grows to form colonies in places close to water or stagnant.
Kingdom: Plantae
Phylum: Tracheophyta
Subphylum: Angiospermae
Class: Magnoliopsida
Order: Caryophyllales
Family: Polygonaceae
Subfamily: Polygonoideae
Tribe: Persicarieae
Subtribe: Persicariinae
Genus: Persicaria
Species: Persicaria barbata
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