What is "guayania"

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

1. Guayania bulbosa (Aristeg.) R.M.King & H.Rob.
2. Guayania cerasifolia (Sch.Bip. ex Baker) R.M.King & H.Rob.
3. Guayania crassicaulis (Steyerm.) R.M.King & H.Rob.
4. Guayania penninervata (Wurdack) R.M.King & H.Rob.
5. Guayania roupalifolia (B.L.Rob.) R.M.King & H.Rob.
6. Guayania yaviana (Lasser & Maguire) R.M.King & H.Rob.