Which genus covers a wider rage of habitation, Basselinia or Crescentia?
Basselinia:  The entire genus is endemic to the Island of New Caledonia in the Pacific. Crescentia: Crescentia (calabash tree, huingo, krabasi, or kalebas) is a genus of six species of flowering plants in the family Bignoniaceae, native to southern North America, the Caribbean, Central America and northern South America.
i don't know