Which plant grows further North, Zamia or Vallea?
Zamia: Zamia is a genus of cycad of the family Zamiaceae, native to Mexico, the West Indies, and Central and South America as far south as Bolivia. Zamia:  The range of one species ("Z. integrifolia", extends into the contiguous United States, i.e. Georgia and Florida. Vallea: Vallea is a genus of trees in the family Elaeocarpaceae.
Zamia