Family
Polygonaceae
Synonyms
Polygonum convolvulus
Distribution in Canada
Found in Canada
Duration of life cycle
Annual
Seed/Fruit type
- achene - a one-seeded, dry fruit
- often partially or totally enclosed in a papery covering derived from the flower
Seed identification features
Size
- length: 2.5–3.5 mm
- width: 2.0–2.5 mm
Shape
- in outline: oval (widest at middle)
- in cross-section: strongly triangular
Surface texture
- on achene faces: roughened with fine lines
- on edges: smooth and shiny
Colour
- mature achenes: black
- immature achenes: dull brown
Other structures
- outer covering may wholly or partially cover the achene
- outer covering is light brown, slightly wrinkled and papery, with lines where lobes overlap
Similar species
Prostrate knotweed (Polygonum aviculare)
- found across Canada and the United States
- similar to wild buckwheat in size (prostrate knotweed is slightly smaller in width by 0.5 mm), black colour, triangular cross-section, widespread distribution and roughened surface texture
- seeds do not have smooth edges
- obovate (egg-shaped) outline, with widest point below middle
Photos
Similar species
