Conoclinium and Catalpa, have which mutual two attributes?
Conoclinium: Conoclinium, the mistflowers, is a genus of four species of herbaceous perennial flowering plants, native to North America. 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.
i don't know