Introduction
Opuntia arizonica Griffiths is best thought of as a smaller and spiny version of O. engelmannii. It was placed in synonymy with O. engelmannii by some authors, but the Opuntia Web considers it to be a distinct species.
Links
O. arizonica at Tropicos
O. arizonica at the Plant List
O. arizonica at IPNI
![Opuntia arizona 7468 (in habitat)](https://i0.wp.com/opuntiads.com/griffiths/wp-content/uploads/Opuntia-arizonica-7468-in-habitatb.jpg?resize=640%2C480)