Sorry, there are currently no southeastern Arizona plants on this website with a common name beginning with 'X'.

English plant common names that start with 'X' are VERY rare, and although there are some plant scientific names that begins with 'X' (like Xanthium strumarium), I don't know of any U.S. plant species with an 'X' common name.

An identification guide to Sonoran Desert plants and Tucson wildflowers