Chasmanthe is a genus of flowering plants in the iris family, first described in 1932.
Zenobia, called honeycup, is a North American genus of shrubs in the heath family.
Chasmanthe floribunda is a species of flowering plants in the iris family which is known by the common name African flag.
 This plant is endemic to Cape Province in South Africa, but it has been introduced to other areas of similar climate, and is considered to be naturalized in California, Algeria, Australia, Argentina, and St. Helena.

Question: Are both Chasmanthe and Zenobia plants?
Answer: yes