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.
The scope of Allionia incarnata L. encompasses North America, the West Indies, Central America, and South America, whereas Allionia choisyi Standley is more limited to North America, specifically in Arizona, Utah, New Mexico, and Texas.