Which of these are found only on a single continent, Pamianthe or Bombax?
Pamianthe: Pamianthe is a genus of South American bulbous perennials in the Amaryllis family, subfamily Amaryllidoideae. Pamianthe:  They can be found in sandy, but rocky areas in Ecuador, Peru, and Bolivia. Bombax:  They are native to western Africa, the Indian subcontinent, Southeast Asia, as well as subtropical regions of East Asia and northern Australia.
Pamianthe