Do both Tithonia and Pachysandra belong to the taxonomic category of genus?
Tithonia Tithonia is a genus of flowering plants in the sunflower tribe within the Asteraceae family.
Orthiopteris Orthiopteris is a fern genus in family Saccolomataceae. Further phylogenetic studies need to be made to determine whether "Orthiopteris" and "Saccoloma" (the only other Saccolomataceae species) should be considered separate genera.