pigweed

1. See goosefoot.
2. See amaranth (sense 1).

Amaranthus spp., Portulaca oleracea, Trianthema portulacastrum.

The noun has 3 meanings:

Meaning #1: common weedy European plant introduced into North America; often used as a potherb
  Synonyms: lamb's-quarters, wild spinach, Chenopodium album

Meaning #2: leaves sometimes used as potherbs; seeds used as cereal; southern United States to Central America; India and China
  Synonym: Amaranthus hypochondriacus

Meaning #3: leaves collected from the wild
  Synonyms: lamb's-quarter, wild spinach

Pigweed can mean any of a number of weedy plants which may be used as pig fodder:

• Amaranthus species
  • Amaranthus palmeri, the 'pigweed' resistant to glyphosate in the US southeast.
• Chenopodium album (White Goosefoot)
• Portulaca species

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