What is "zexmenia"

Zexmenia is a genus of Latin American plants in the sunflower tribe within the daisy family.

numerous species now considered more suited to other genera: Angelphytum Calyptocarpus Dimerostemma Jefea Lasianthaea Lundellianthus Oblivia Otopappus Oyedaea Sanvitalia Tuxtla Verbesina Wamalchitamia Wedelia