Senegalia greggii

Senegalia greggii is a species of Senegalia native to the southwestern United States and northern Mexico, from the extreme south of Utah (where, at 37°10' N it is the northernmost naturally occurring Senegalia species anywhere in the world) south through southern Nevada, southeast California, Arizona, New Mexico and western Texas to Baja California, Sinaloa and Nuevo León in Mexico.

Common names include catclaw acacia, catclaw mesquite, Gregg's catclaw, devil's claw, paradise flower, wait-a-minute tree, and wait-a-bit tree; these names mostly come from the fact that the tree has numerous hooked prickles with the shape and size of a cat's claw, that tend to hook onto passers-by; the hooked person must stop ("wait a minute") to remove the prickles carefully to avoid injury or shredded clothing. (Note: "cat's claw" is also used to refer to Uncaria tomentosa, a woody vine found in the tropical jungles of South and Central America)

The specific epithet greggii refers to Josiah Gregg, author, explorer, and amateur naturalist of the American Southwest and northern Mexico.