Are Edraianthus and Catalpa both flowering plants?
yes
Edraianthus
Edraianthus (rock bells or grassy bells) is a small genus of flowering plants in the bellflower family Campanulaceae.
 "Edraianthus" species are native to mountains of the Balkan, including Croatia, Bosnia and Serbia, and as far as Romania, Italy and Greece.
Catalpa
Catalpa, commonly called catalpa or catawba, is a genus of flowering plants in the family Bignoniaceae, native to warm temperate and subtropical regions of North America, the Caribbean, and East Asia.
Bignonia
Bignonia is a genus of flowering plants in the catalpa family, Bignoniaceae.
 Its genus and family were named after Jean-Paul Bignon by his protégé Joseph Pitton de Tournefort in 1694, and the genus was established as part of modern botanical nomenclature in 1753 by Carl Linnaeus. Catalpa (disambiguation)
Catalpa is a genus of flowering plants in the family Bignoniaceae.