| Amaranthus hybridus | 
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| Scientific classification  | 
| Kingdom: | 
Plantae | 
 
| Clade: | 
Tracheophytes | 
 
| Clade: | 
Angiosperms | 
 
| Clade: | 
Eudicots | 
 
| Order: | 
Caryophyllales | 
 
| Family: | 
Amaranthaceae | 
 
| Genus: | 
Amaranthus | 
| Species: | 
A. hybridus  | 
| Binomial name | 
Amaranthus hybridus
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| Synonyms | 
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- Amaranthus aureus Moq.
 
- Amaranthus batalleri Sennen
 
- Amaranthus bellardii Moq.
 
- Amaranthus berchtholdii Moq.
 
- Amaranthus catechu Moq.
 
- Amaranthus caudatus Baker & Clarke
 
- Amaranthus chlorostachys Willd.
 
- Amaranthus eugenii Sennen
 
- Amaranthus flavescens Moq.
 
- Amaranthus hecticus Willd.
 
- Amaranthus incurvatus Trimen ex Gren. & Gord.
 
- Amaranthus intermedius Guss. ex Moq.
 
- Amaranthus laetus Willd.
 
- Amaranthus laxiflorus Comelli ex Pollini
 
- Amaranthus neglectus Moq.
 
- Amaranthus nepalensis Moq.
 
- Amaranthus paniculatus var. sanguineus Regel
 
- Amaranthus patulus f. multispiculatus (Sennen) Priszter
 
- Amaranthus patulus var. multispiculatus Sennen
 
- Amaranthus pseudoretroflexus (Thell.) Almq.
 
- Amaranthus quitensis Kunth
 
- Amaranthus retroflexus var. chlorostachys A. Gray
 
- Amaranthus retroflexus var. hybridus A. Gray
 
- Amaranthus retroflexus subsp. quitensis (Kunth) O.Bolòs & Vigo
 
- Amaranthus spicatus Rchb.
 
- Amaranthus timeroyi Jord. ex Moq.
 
- Amaranthus trivialis Rota
 
- Galliaria hybrida (L.) Nieuwl.
  
 
  
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Amaranthus hybridus, commonly called green amaranth, slim amaranth, smooth amaranth, smooth pigweed, or red amaranth, is a species of annual flowering plant. It is a weedy species found now over much of North America and introduced into Europe and Eurasia.