Chenopodium ambrosioides
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 2: 14.
Chenopodium ambrosioides
Abbé H. Coste - Flore de la France (1937). Source: http://www.tela-botanica.org/ - This image is in public domain because its copyright has expired.
Chenopodium ambrosioides
USDA, NRCS. 2009. The PLANTS Database (http://plants.usda.gov, 22 June 2009). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.