Weed Seed: Hedge bindweed/Great bindweed (Calystegia sepium)

Family

Convolvulaceae

Synonyms

Convolvulus sepium

Distribution in Canada

Found in Canada

Duration of life cycle

Perennial

Seed/Fruit type

True seed

Seed identification features

Size

  • length: 3.5–5.0 mm
  • width: 3.5–4.0 mm

Shape

  • in outline: oval
  • in cross-section: rounded-triangular

Surface texture

  • smooth, dull
  • may have scattered small tubercles (wart-like projections)

Colour

  • surface is a light to dark reddish-brown

Other structures

  • hilum is a diagonal area on inner surface of seed
  • hilum is shaped like a half-circle, and often orange in colour

Similar species

Field bindweed (Convolvulus arvensis)

  • found across Canada and the United States
  • similar to great bindweed in shape, size, reddish-brown colour and diagonal hilum
  • ~0.5 mm smaller than great bindweed
  • covered with network of fine lines and dense tubercles
  • hilum is oval in shape (hilum is D-shaped in great bindweed)

Photos

Photo - Great bindweed (Calystegia sepium) seed (showing hilum)
Great bindweed (Calystegia sepium) seed (showing hilum)
Photo - Great bindweed (Calystegia sepium) seeds
Great bindweed (Calystegia sepium) seeds
Photo - Great bindweed (Calystegia sepium) seeds and capsule
Great bindweed (Calystegia sepium) seeds and capsule

Similar species

Photo - Similar species: Field bindweed (Convolvulus arvensis) seeds
Similar species: Field bindweed (Convolvulus arvensis) seeds
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