Amaranthus retroflexus
- Illustration, systematic position, morphology, biology, distribution, ecology and economic significance of Common Amaranth.
- http://www.agroatlas.spb.ru/weeds/Amaranthus_retroflexus_en.htm

Amaranthus blitoides
- Photograph, systematic position, morphology, biology, distribution, ecology and economic significance of Spreading Pigweed.
- http://www.agroatlas.spb.ru/weeds/Amaranthus_blitoides_en.htm

Amaranthus albus
- Photograph, systematic position, morphology, biology, distribution, ecology and economic significance of Tumbleweed Amaranth.
- http://www.agroatlas.spb.ru/weeds/Amaranthus_albus_en.htm

Amaranthus hybridus
- Photograph of Smooth Pigweed.
- http://oak.ppws.vt.edu/~sforza/weeds/amach.html

Amaranthus blitum
- USDA species account for Purple Amaranth.
- http://plants.usda.gov/java/profile?symbol=AMBL2

Amaranthus rudis
- Tall Amaranth.
- http://plants.usda.gov/java/profile?symbol=AMRU

Amaranthus hypochondriacus
- short description and medicinal uses
- http://www.botanical.com/botanical/mgmh/a/amara030.html

Amaranthus spinosus
- image
- http://www.botany.hawaii.edu/faculty/carr/images/ama_spi_fl.jpg