Can Chasmanthe and Heracleum be distinguished as being of a different genus or family? 
Chasmanthe: Chasmanthe is a genus of flowering plants in the iris family, first described in 1932. Heracleum (plant): Heracleum is a genus of about 60 species (depending on taxonomic interpretation) of biennial and perennial herbs in the carrot family Apiaceae.
yes