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Amaranthus, also known by the common name pigweed, is a widely distributed genus of annual, short-living herb, occurring mostly in temperate and tropical regions, belonging to the Amaranth family (Amaranthaceae). There are about 60 species.
There is still some confusion regarding the taxonomic names of some of the plants in this genus.
 Green Amaranth ( Amaranthus hybridus) Species (with their common names)
- Greenstripe, Amaranthus acanthochiton
- Sharplobe Amaranth, Amaranthus acutilobius
- Tumbleweed, aka. White Pigweed, Prostrate Pigweed, Pigweed Amaranth, and White Amaranth, Amaranthus albus
- Sandhill Amaranth, Amaranthus arenicola
- Southern Amaranth, Amaranthus australis
- Bigelow's Amaranth, Amaranthus bigelovii
- Mat Amaranth, aka. Prostrate Amaranth, and Prostrate Pigweed, Amaranthus blitoides
- Purple Amaranth, Amaranthus blitum
- Brown's Amaranth, Amaranthus brownii
- California Amaranth, aka. California Pigweed, Amaranthus californicus
- Tidal-marsh Amaranth, Amaranthus cannabinus
- Loves-lies-bleeding, aka. Pendant Amaranth, Tassel Flower, and Quilete, Amaranthus caudatus
- Chihuahuan Amaranth, Amaranthus chihuahuensis
- Amaranthus chlorostachys
- Spreading Amaranth, Amaranthus crassipes
- Crispleaf Amaranth, Amaranthus crispus
- Purple Amaranth, aka. Red Amaranth, Mexican Grain Amaranth, Princes Feather, and Caterpillar, Amaranthus cruentus
 Spiny Amaranth ( Amaranthus spinosus) - Large-fruit Amaranth, Amaranthus deflexus
- Spleen Amaranth, aka. Khada Sag, Amaranthus dubius
- Fringed Amaranth, aka. Fringed Pigweed, Amaranthus fimbriatus
- Fringed Amaranth, Amaranthus fimbriatus denticulatus
- Fringed Amaranth, Amaranthus fimbriatus fimbriatus
- Florida Amaranth, Amaranthus floridanus
- Amaranthus graecizans (not accepted) = Amaranthus albus Prostrate Amaranth, Prostrate Pigweed.
- Gregg's Amaranth, Amaranthus greggii
- Smooth Amaranth, aka. Slim Amaranth, Spleen Amaranth, Green Amaranth, Green Pigweed, Smooth Pigweed, Red Amaranth, and Wild Beet, Amaranthus hybridus
- Gentlemans Cane, Amaranthus hybridus erythrostachys
- Prince-of-Wales-feather, aka. Princess Feather, Amaranthus hypochondriacus
 Green Amaranth ( Amaranthus viridis) - Amaranthus leucocarpus
- Amaranthus lineatus [[Australian Amaranth]
- Amaranthus lividus (synonym) (= Amaranthus blitum): Purple Amaranth
- Amaranthus mantegazzianus Quinoa de Castilla
- Amaranthus minimus
- Amaranthus muricatus African Amaranth
- Amaranthus myrianthus (synonym)(= Amaranthus greggii)
- Amaranthus obcordatus Trans-Pecos Amaranth
- Amaranthus palmeri Palmer's Amaranth, Carelessweed
- Amaranthus paniculus Reuzen Amaranth
- Amaranthus polygonoides Tropical Amaranth
- Amaranthus powelii Green Amaranth, Powell Amaranth, Powell Pigweed.
- Amaranthus pringlei Pringle's Amaranth
- Amaranthus pumilus Seaside Amaranth
- Amaranthus quitensis Ataco, Sangorache
- Amaranthus retroflexus Red-root Amaranth, Redroot Pigweed, Rough Pigweed, Green Amaranth, Wild Beet, Beetroot, Common Amaranthus, Careless Weed
- Amaranthus rudis Tall Amaranth, Common Waterhemp
- Amaranthus scleropoides Bone-bract Amaranth
- Amaranthus spinosus Spiny Amaranth, Prickly Amaranth, Thorny Amaranth
- Amaranthus standleyanus
- Amaranthus tamariscinus (synonym)(= Amaranthus rudis)
- Amaranthus thunbergii Thunberg's Amaranth
- Amaranthus torreyi Torrey's Amaranth
- Amaranthus tricolor Joseph's-coat
- Amaranthus tuberculatus Rough-fruit Amaranth, Tall Waterhemp
- Amaranthus viridis Slender Amaranth, Green Amaranth
- Amaranthus watsonii Watson's Amaranth
- Amaranthus wrightii Wright's Amaranth
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