Flourensia is a genus of flowering plants in the family Asteraceae.Candolle, Augustin Pyramus de. 1836. Prodromus Systematis Naturalis Regni Vegetabilis 5: 592–593 in Latin It contains subshrubs and shrubs, which are commonly known as tarworts. They are found in the southwestern United States, Mexico, and central South America (Bolivia and northern Argentina). The genus name honours French physiologist Jean Pierre Flourens (1794–1867).
Phylogenetic studies found that the genus as previously circumscribed was polyphyletic, and in 2023 many of the South American species were placed in the new genus Austroflourensia.
Species 20 species are currently accepted. Flourensia blakeana M.O.Dillon – Argentina (Tucuman, Catamarca) Flourensia campestris Griseb. – Argentina (La Rioja, San Juan, Santiago del Estero, Catamarca) Flourensia cernua DC. – American tarwort, tarbush - Chihuahua, Coahuila, USA (Texas New Mexico Arizona) Flourensia collodes (Greenm.) S.F.Blake – Chiapas, Oaxaca Flourensia dentata S.F.Blake – Zacatecas Flourensia glutinosa - Oaxaca and Puebla Flourensia hirta S.F.Blake – Argentina (La Rioja, Catamarca) Flourensia ilicifolia Brandegee – Coahuila Flourensia laurifolia DC. – San Luis Potosí, Tamaulipas, Hidalgo Flourensia leptopoda S.F.Blake – Argentina (La Rioja, San Juan) Flourensia macroligulata Seeligm. – Argentina (Jujuy, Tucuman) Flourensia microphylla Flourensia monticola M.O. Dillon – Coahuila, Nuevo León Flourensia oolepis S.F.Blake – Argentina (Catamarca, Córdoba, San Luis) Flourensia pringlei (A.Gray) S.F.Blake – Chihuahua, Durango, New Mexico (Hidalgo County) Flourensia pulcherrima M.O.Dillon – Durango Flourensia resinosa (Brandegee) S.F.Blake – Hidalgo, Querétaro Flourensia retinophylla S.F.Blake – Coahuila Flourensia riparia Griseb. – Argentina (Jujuy, Salta, Catamarca, Tucuman) Flourensia solitaria S.F.Blake – Coahuila
Formerly placed here Austroflourensia angustifolia (aș Flourensia angustifolia (DC.) S.F.Blake) – Peru Austroflourensia cajabambensis (as Flourensia cajabambensis M.O.Dillon) – Peru Austroflourensia fiebrigii (as Flourensia fiebrigii S.F.Blake) – Argentina, Bolivia Austroflourensia glutinosa (as Flourensia heterolepis S.F.Blake) – Bolivia (Cochabamba, Santa Cruz), Peru (Cusco) Austroflourensia hirtissima (as Flourensia hirtissima S.F.Blake) – Argentina (Río Negro) Austroflourensia macrophylla (as Flourensia macrophylla (A.Gray) S.F.Blake) – Peru Austroflourensia niederleinii (as Flourensia niederleinii S.F.Blake) – Argentina (La Rioja) Austroflourensia peruviana (as Flourensia peruviana M.O.Dillon) – Peru (Ayacucho, Huancavelica) Austroflourensia polycephala (as Flourensia polycephala M.O.Dillon) – Peru (Apurímac, Cusco) Austroflourensia suffrutescens (as Flourensia polyclada and Flourensia suffrutescens ) – Argentina (Jujuy, Salta) Austroflourensia thurifera (as Flourensia thurifera (Molina) DC.) – Chile (Coquimbo, Santiago, Valparaíso) Austroflourensia tortuosa (as Flourensia tortuosa Griseb.) – Argentina (Salta, Catamarca, Tucuman)
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