Fallopia dentatoalata - Toothed-Wing Knotweed

Toothed-Wing Knotweed is an annual herb with twining stem up to 1-2 m long, channeled, with few branches. Leaf stalks are 2-4 cm long, slender. Leaves are 3-6 cm long, 2.5-4 cm, both surfaces hairless, base wide heart- shaped, apex long-pointed. ocrea brownish, 3-4 mm, membranous, oblique, not ciliate. Flowers are borne in racemes in leaf axils or at the end pf branches. Racemes are leafy, lax, interrupted, 4-12 cm long, usually longer than leaves. Bracts are funnel-shaped, 2-3 mm, membranous, oblique, tip pointed, each 4- or 5-flowered. Flower-stalks are short, elongated in fruit. Flowers are white or greenish, 5-parted - tepals unequal in size, outer 3 much longer, winged on abaxial surface. Wings are toothed, continuing to the base of the flower-stalk. Perianth (including wings) in fruit obovate, 5-6 mm in diameter. Stamens are 8, included. Achenes are hidden inside the persistent tepals, black, slightly shiny, ellipsoid, trigonous, 4-4.5 mm. Flowering: June-September.