What is "crossothamnus"

Crossothamnus is a genus of South American flowering plants in the sunflower family.

1. Crossothamnus gentryi R.M.King & H.Rob. - Peru, Ecuador
2. Crossothamnus killipii (R.M.King & H.Rob.) R.M.King & H.Rob. - Colombia
3. Crossothamnus pascoanus M.O.Dillon & B.L.Turner - Peru
4. Crossothamnus weberbaueri (Hieron.) R.M.King & H.Rob. - Peru