Question: What type of plants are Desfontainia and Tithonia?
Sentence (from "Desfontainia"): Desfontainia is a genus of flowering plants placed currently in the family Columelliaceae, though formerly in Loganiaceae, Potaliaceae (now subsumed in Gentianaceae), or a family of its own, Desfontainiaceae.
Relevant evidence: Yes