Flourensia is a genus of flowering plants in the family Asteraceae. 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 (B.L.Rob. & Greenm.) S.F.Blake - 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 S.F.Blake
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
Austroflourensia angustifolia (DC.) J.C.Ospina & S.E.Freire (aș Flourensia angustifolia (DC.) S.F.Blake) – Peru
Austroflourensia...
