Fallopia Adans.

Vines or herbs, annual or perennial; roots fibrous or woody; sometimes rhizomatous. Stems erect to scandent, rarely procumbent, glabrous or pubescent. Leaves deciduous, cauline, alternate, petiolate; ocrea persistent or deciduous, chartaceous; petiole base articulated, extrafloral nectaries sometimes present; blade broadly ovate to triangular, margins entire or wavy. Inflorescences terminal and spikelike, or terminal and axillary and paniclelike or racemelike, pedunculate or not. Pedicels present. Flowers bisexual, or bisexual and unisexual, some plants with bisexual flowers, other plants with only pistallate flowers 1-5 per ocreate fascicle, base stipelike; perianth usually accrescent in fruit, pale green or white to pink, campanulate, glabrous or, rarely, with blunt, hyaline hairs; tepals 5, connate nearly completely or only basally, petaloid, dimorphic, outer 3 winged or keeled, larger than inner 2; stamens 6-8; filaments distinct, free, glabrous or pubescent proximally; anthers yellow to pink or red, ovate to elliptic; styles 3, spreading, connate basally or nearly completely; stigmas capitate, fimbriate, or peltate. Achenes included or exserted, brown to dark brown or black, not winged, 3-gonous, glabrous. Seeds: embryo straight. x = 10, 11.