Laennecia or Laënnecia is a genus of flowering plants in the family Asteraceae.Cassini, Alexandre Henri Gabriel de. 1822. Dictionnaire des Sciences Naturelles [Second edition] 25: 91–92in French The plants are native to Mesoamerica, South America, and the southwestern United States. Common name is "horseweed."
SpeciesBiota of North America Program 2013 county distribution maps Laennecia altoandina (Cabrera) G.L.Nesom - Jujuy in Argentina, La Paz in Bolivia, Cusco in Peru Laennecia araneosa (Urb.) G.Sancho & Pruski - Dominican Republic Laennecia artemisiifolia (Meyen & Walp.) G.L.Nesom Laennecia chihuahuana G.L.Nesom - Chihuahua Laennecia confusa (Cronquist) G.L.Nesom - Chiapas, Guatemala, Costa Rica Laennecia coulteri (A.Gray) G.L.Nesom - Mexico (Coahuila, Nuevo León, Sonora), United States (CA NV AZ UT CO NM TX AL) Laennecia eriophylla (A.Gray) G.L.Nesom - Arizona (Pima, Santa Cruz, Cochise Counties) Laennecia filaginoides DC. - Central America, Colombia, Ecuador, Venezuela, Mexico, Texas Laennecia gnaphalioides (Kunth) Cass. - Chiapas, Oaxaca, Central America, Colombia, Ecuador, Peru, Bolivia, Venezuela Laennecia microglossa (S.F.Blake) G.L.Nesom - Nuevo León Laennecia pimana G.L.Nesom & Laferr. - Chihuahua Laennecia schiedeana (Less.) G.L.Nesom - Central America, Mexico, USA (AZ CO NM) Laennecia sophiifolia (Kunth) G.L.Nesom - South America, Mesoamerica, USA (AZ TX NM) Laennecia spellenbergii G.L.Nesom - Durango Laennecia turnerorum G.L.Nesom - Texas (Brewster County)
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