Which genus can be found on the most continents, Hechtia or Zantedeschia?
Hechtia: Hechtia is a genus of the botanical family Bromeliaceae, subfamily Pitcairnioideae. Hechtia:  Its species are native to Mexico, Central America, and Texas. Zantedeschia: Zantedeschia is a genus of 8 species of herbaceous, perennial, flowering plants in the family Araceae, native to southern Africa from South Africa north to Malawi.
i don't know