Which Genus has four species, Duboisia or Ctenanthe?
Duboisia: Duboisia (commonly called corkwood tree) is a genus of small perennial shrubs and trees up to 14 metres (46 feet) tall, with extremely light wood and a thick corky bark. Duboisia:  There are four species; all occur in Australia, and one also occurs in New Caledonia. Ctenanthe: Ctenanthe is a genus of flowering plants of the family Marantaceae described as a genus in 1884.
Duboisia