Which appears on more continents, Utricularia species or Witch-hazel species?
Utricularia:  They occur in fresh water and wet soil as terrestrial or aquatic species across every continent except Antarctica. Witch-hazel: Witch-hazels ("Hamamelis," ) are a genus of flowering plants in the family Hamamelidaceae, with four species in North America ("H. mexicana", "H. ovalis", "H. virginiana", and "H. vernalis"), and one each in Japan ("H. japonica") and China ("H. mollis").
i don't know