''Guilleminea'' is a small genus of plants in the family

Amaranthaceae Amaranthaceae ( ) is a family of flowering plants commonly known as the amaranth family, in reference to its type genus '' Amaranthus''. It includes the former goosefoot family Chenopodiaceae and contains about 165 genera and 2,040 species, maki ...

. They are sometimes known as matweeds. These are prostrate, mat-forming perennial herbs growing from

taproot A taproot is a large, central, and dominant root from which other roots sprout laterally. Typically a taproot is somewhat straight and very thick, is tapering in shape, and grows directly downward. In some plants, such as the carrot, the taproot ...

s. 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

weed A weed is a plant considered undesirable in a particular situation, growing where it conflicts with human preferences, needs, or goals.Harlan, J. R., & deWet, J. M. (1965). Some thoughts about weeds. ''Economic botany'', ''19''(1), 16-24. Pla ...

. The genus was named after the French botanist

Jean Baptiste Antoine Guillemin Jean Baptiste Antoine Guillemin (20 January 1796 in Pouilly-sur-Saône – 15 January 1842 in Montpellier) was a French botanist. He studied at the municipal college in Seurre, where he was considered one of the most distinguished pupils. ...

Species

The genus contains seven species. *'' Guilleminea chacoensis'' – Paraguay and northeastern Argentina *'' Guilleminea densa'' – Oklahoma, Colorado, and California to northern Argentina *'' Guilleminea elongata'' – Uruguay *'' Guilleminea fragilis'' – Brazil (Mato Grosso do Sul) and Paraguay *'' Guilleminea gracilis'' – Colombia, Ecuador, Peru, Bolivia, and northwestern Argentina *'' Guilleminea hirsuta'' – Bolivia to northwestern Argentina (Salta Province) *'' Guilleminea lanuginosa'' – Arkansas to New Mexico and northern Mexico, Hispaniola

References

External links

Jepson Manual TreatmentUSDA Plants Profile: North American Species
Amaranthaceae Amaranthaceae genera Taxa named by Carl Sigismund Kunth Flora of the Americas {{Amaranthaceae-stub