The range of Allionia incarnata L. includes North America, the West Indies, Central America, and South America, while Allionia choisyi Standley is more restricted in North America, occurring only in Arizona, Utah, New Mexico, and Texas.
Allionia incarnata L. has a broader distribution across North America, the Caribbean, Central America, and South America, whereas Allionia choisyi Standley is confined to a narrower area within North America, namely Arizona, Utah, New Mexico, and Texas.