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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Gentianales

Familia: Rubiaceae
Subfamilia: Rubioideae
Tribus: Spermacoceae
Genus: Stenaria
Species: S. butterwickiae – S. mullerae – S. nigricans – S. rupicola – S. sanchezii – S. umbratilis

Stenaria (Raf.) Terrell, Sida 19(3): 592. (2001)

Type species: Stenaria nigricans (Lam.) Terrell, Sida 19: 600. (2001)


Houstonia subg. Stenaria Raf., Ann. Gén. Sci. Phys. 5: 226. (1820)


Terrell, E.E. 2001. Sida 19(3): 592.
Govaerts, R. et al. 2019. Stenaria in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2019 June 13. Reference page.
International Plant Names Index. 2019. Stenaria. Published online. Accessed: June 13 2019. 2019. Stenaria. Missouri Botanical Garden. Published on the internet. Accessed: 2019 June 13.
USDA, ARS, Germplasm Resources Information Network. Stenaria in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 08-Apr-12.

Stenaria is a genus of flowering plants in the family Rubiaceae. It is a small genus, consisting of around six species native to the United States, Mexico, and The Bahamas.[1] All species of Stenaria are restricted to Mexico and the southwestern United States, except for the wide-ranging Stenaria nigricans which extends northward and eastward.[2]

Stenaria are herbaceous perennials or low shrubs. Flowers are produced in cymes, and can be white, purple, or pink. Stenaria can be morphologically distinguished from the similar genus Hedyotis by its non-crateriform seeds.[2]

Stenaria was first recognized as a genus in 2001. It comprises species formerly classified as Hedyotis or Houstonia.[2]

Stenaria butterwickiae
Stenaria mullerae
Stenaria nigricans
Stenaria rupicola
Stenaria sanchezii
Stenaria umbratilis


Stenaria World Checklist of Selected Plant Families, Kew Royal Botanic Gardens
Terrell, Edwards (2001). "Taxonomy of Stenaria (Rubiaceae:Hedyotideae), a new genus including Hedyotis nigricans". Sida. 19 (3): 592. Retrieved February 6, 2019.

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