Laennecia or Laënnecia is a genus of flowering plants in the sunflower family. The plants are native to Mesoamerica, South America, and the southwestern United States. Common name is 'horseweed.'
SpeciesLaennecia 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 ...