Guilleminea
genus of plants
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 taproots. 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.
The genus was named after the French botanist Jean Baptiste Antoine Guillemin.
Species
The genus contains seven species.
Guilleminea chacoensis Pedersen – Paraguay and northeastern Argentina
Guilleminea densa (Willd. ex Schult.) Moq. – Oklahoma, Colorado, and California to northern Argentina
Guilleminea elongata Mears – Uruguay
Guilleminea fragilis Pedersen – Brazil (Mato Grosso do Sul) and Paraguay
Guilleminea gracilis R.E.Fr.
Begin with the source’s own compact description: “Guilleminea” is genus of plants. The dossier treats that line as a proposition to test through Guilleminea, genus and plants, not as a finished interpretation.
Why this record matters
The phrase “genus of plants” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Jun 29, 2025. The linked authority identifier is Q5616103. None of the 0 selected statements returned an explicit reference.
Scientific names, classifications and consensus can change while older terminology persists in catalogues and historical literature. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Guilleminea” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.