What is "tessaria"

Tessaria is a genus of South American plants in the stinkwort tribe within the daisy family.

1. Tessaria absinthioides (Hook. & Arn.) DC. - Brazil, Argentina, Chile, Paraguay, Uruguay
2. Tessaria fastigiata (Griseb.) Cabrera - Bolivia, Paraguay, Argentina
3. Tessaria integrifolia Ruiz & Pav. - Panamá, Colombia, Venezuela, Ecuador, Peru, Bolivia, Brazil, Paraguay

several species now considered members of Pluchea or Pterocaulon