` :::Think of it like this...MesoAmerica and SA are big areas. The ``less certain`` part means narrowing down to a smaller area. I see two options a) cut ``The exact location of origin of C. ficifolia and C. moschata is less certain`` entirly or b) make is something like ``The precise location of origin of C. ficifolia and C. moschata within those areas is less certain``. I lean towards cutting it entirely.     `