Question: What continent are the genuses Allocasuarina and Acacia mainly native to? 
Sentence (from "Acacia"): Australian botanists proposed that this would be more disruptive than setting a different type species ("A. penninervis") and allowing this large number of species to remain "Acacia", resulting in the two African lineages being renamed "Vachellia" and "Senegalia", and the two New World lineages renamed "Acaciella" and "Mariosousa".
Relevant evidence: No