WordNet sense 1 (European plant naturalized in North America; often collected from the wild as a potherb):

allgood, good-king-henry, Chenopodium bonus-henricus, fat hen

WordNet sense 2 (common weedy European plant introduced into North America; often used as a potherb):

lamb's-quarters, pigweed, Chenopodium album

WordNet sense 3 (leaves collected from the wild):

lamb's-quarter