Polygonum scandens L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Twining perennial to 5 m, the stem sharply angled, often scabrellate on the angles; lvs oblong-ovate or broadly cordate, acuminate, deeply cordate at base; ocreae very oblique, smooth, racemes from most upper axils, usually unbranched, leafless or nearly so, 5–11 cm, interrupted; pedicels winged above the joint; perianth 1.5–2.5 mm, white, achene very glossy black, 3–5 mm, closely invested and much exceeded by the perianth; outer 3 tep at maturity with broadly winged midrib, the whole fr, measured from the joint in the pedicel, 7–15 mm; 2n=20, and some higher number. Moist woods, thickets, and roadsides; Que. to N.D., s. to Fla. and Tex. (Bilderdykia s.; Tiniaria s.) Three vars.