Guilleminea is a small genus of plants in the family Amaranthaceae. They are sometimes known as matweeds. These are prostrate, mat-forming perennial herbs growing from . The genus includes seven species native to the Americas, ranging from Arkansas, Colorado, and California to northern Argentina.[ The best known species is perhaps Guilleminea densa, the small matweed, which has been introduced to parts of Africa, Australia, and the eastern United States where it is a noxious weed.
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The genus was named after the French botanist Jean Baptiste Antoine Guillemin.
Species
The genus contains seven species.[
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Guilleminea chacoensis – Paraguay and northeastern Argentina
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Guilleminea densa – Oklahoma, Colorado, and California to northern Argentina
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Guilleminea elongata – Uruguay
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Guilleminea fragilis – Brazil (Mato Grosso do Sul) and Paraguay
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Guilleminea gracilis – Colombia, Ecuador, Peru, Bolivia, and northwestern Argentina
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Guilleminea hirsuta – Bolivia to northwestern Argentina (Salta Province)
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Guilleminea lanuginosa – Arkansas to New Mexico and northern Mexico, Hispaniola
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