Polygonum convolvulus L.
Polygonum convolvulus L. var. convolvulus
Bilderdykia convolvulus (L.) Dumort.
Fallopia convolvulus (L.) Á. Löve
Reynoutria convolvulus (L.) Shinners
Tiniaria convolvulus (L.) Webb & Moq.
Fallopia convolvulus (L.) A. Löve
Black bindweed, wild buckwheat, false buckwheat
Wild buckwheat is a European native. It is a vine that snakes along the ground or clambers over other plants or anything else it can latch onto, winding itself in a clockwise direction around supports. Plants are up to 3' (1 m) long. At points where leaves attach there is an ocrea, or sheath. Leaves are alternate and roughly triangular to heart-shaped, with smooth edges. The lower corners of each triangle are pointed inward toward the leaf petiole (stem). Leaves are ½-2" (1.5-6 cm) × ¼-1" (7-30 mm) wide. Flowers are small, ⅛" (4 mm) each, in long thin clusters, sort of weird-looking, greenish-white to greenish-pink.
Some similar species:
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|Plant||Vines are 20-79" (50-200 cm) high.||Vine up to 3' (1 m) long. At leaf nodes there is an ocrea.||Vines up to 20' (6.1 m) long. Stems are light green to bright red, almost hairless. Where leaves attach to the stem, there is a protective sheath, or ocrea|
|Flowers||Trumpet-shaped, ⅜-⅞" (1-2.5 cm) in diameter, and white or pale pink. Small bracts are separate from the flowers.||Small, greenish-pink to greenish-white, in racemes (bunches); individual flowers are ⅛" (4 mm) long, racemes are up to 2½" (6.3 cm) long||Racemes are 2-8" (5-20 cm) long, with small greenish flowers.|
|Leaves||¾-1¾" (2-5 cm) × ⅜-1" (1-3 cm) wide, either linear or shaped like arrowheads (sagittate).||Alternate, triangular or heart-shaped, lower corners of leaves aim inward toward the petiole (leaf stem)||Ovate, approaching sagittate (shaped like an arrowhead), up to 2" (5 cm) × 4" (10 cm). Leaf petioles are up to 1½" (3.8 cm) long|
|Fruit||Seeds ⅛" (3.2 mm) long, with two flat sides and a convex side, like an orange segment.||Three-sided, with a single dull black seed||Greenish, with white or pink borders.|
Polygonum convolvulus on
Polygonum convolvulus on
Polygonum convolvulus on the Virginia Tech Weed Identification Guide
Polygonum convolvulus on Ontario Wildflowers
Polygonum convolvulus on Wikipedia
Polygonum convolvulus on CalPhotos
Polygonum convolvulus on SEINet—the Southwest Environmental Information Network
Newcomb, Lawrence, Morrison, Gordon (Illus.), Newcomb’s Wildflower Guide, Little, Brown and Company, 1977, p. 322
Peterson, Roger Tory, McKenny, Margaret, Peterson Field Guides: A Field Guide to Wildflowers of Northeastern and North Central North America, Houghton Mifflin, 1968, p. 380
Polygonum convolvulus description by Thomas H. Kent, last updated 16 Sep 2020.