Are both Chasmanthe and Zenobia plants?
yes
Title: Chasmanthe
Passage: Chasmanthe is a genus of flowering plants in the iris family, first described in 1932.
Title: Chasmanthe floribunda
Passage: 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.
Title: Zenobia (plant)
Passage: Zenobia, called honeycup, is a North American genus of shrubs in the heath family.
Chasmanthe Zenobia (plant)