What is "laennecia"

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."

1. Laennecia altoandina (Cabrera) G.L.Nesom - Jujuy in Argentina, La Paz in Bolivia, Cusco in Peru
2. Laennecia araneosa (Urb.) G.Sancho & Pruski - Dominican Republic
3. Laennecia artemisiifolia (Meyen & Walp.) G.L.Nesom
4. Laennecia chihuahuana G.L.Nesom - Chihuahua
5. Laennecia confusa (Cronquist) G.L.Nesom - Chiapas, Guatemala, Costa Rica
6. Laennecia coulteri (A.Gray) G.L.Nesom - Mexico ( Coahuila, Nuevo León, Sonora), USA ( CA NV AZ UT CO NM TX AL)
7. Laennecia eriophylla (A.Gray) G.L.Nesom - Arizona ( Pima, Santa Cruz, Cochise Counties)
8. Laennecia filaginoides DC. - Central America, Colombia, Ecuador, Venezuela, Mexico, Texas
9. Laennecia gnaphalioides (Kunth) Cass. - Chiapas, Oaxaca, Central America, Colombia, Ecuador, Peru, Bolivia, Venezuela
10. Laennecia microglossa (S.F.Blake) G.L.Nesom - Nuevo León
11. Laennecia pimana G.L.Nesom & Laferr. - Chihuahua
12. Laennecia schiedeana (Less.) G.L.Nesom - Central America, Mexico, USA ( AZ CO NM)
13. Laennecia sophiifolia (Kunth) G.L.Nesom - South America, Mesoamerica, USA ( AZ TX NM)
14. Laennecia spellenbergii G.L.Nesom - Durango
15. Laennecia turnerorum G.L.Nesom - Texas ( Brewster County)