Weed Seed: Eastern black nightshade (Solanum ptychanthum)

Family

Solanaceae

Distribution in Canada

Found in AB, SK, MB, ON, QC, NB, NS, NL

Duration of life cycle

Annual

Seed/Fruit type

True seed

Seed identification features

Size

  • length: 1.5–2.0 mm
  • width: 1.0–1.5 mm

Shape

  • in outline: oval
  • in cross-section: thin

Surface texture

  • glossy surface, covered with network of wavy-edged cells

Colour

  • dull golden-yellow

Other structures

  • hilum is a thin slit along thin edge
  • area around hilum is pulled, elongating the seed

Similar species

Black nightshade (Solanum nigrum)

  • found across Canada (except in the Far North) and along the coasts of the United States
  • similar to eastern black nightshade in yellow colour and wavy-edged cell surface pattern
  • larger than eastern black nightshade by ~0.5 mm
  • teardrop shape, with no cell pattern in the centre

Photos

Photo - Eastern black nightshade (Solanum ptychanthum) seed
Eastern black nightshade (Solanum ptychanthum) seed
Photo - Eastern black nightshade (Solanum ptychanthum) seeds
Eastern black nightshade (Solanum ptychanthum) seeds

Similar species

Photo - Similar species: Black nightshade (Solanum nigrum) seed
Similar species: Black nightshade (Solanum nigrum) seed
Photo - Similar species: Black nightshade (Solanum nigrum) seeds
Similar species: Black nightshade (Solanum nigrum) seeds
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