It’s a giant rubber stamp Opuntia in bloom, as seen on Etsy, by AlohaCowboy.

HOWDY!

This is a very large wood mounted rubber stamp of a flowering Prickly Pear Cactus. It is #2156 by CO-MOTION STAMPS in Tucson, Arizona. The wood block measures 4 & 1/2″ x 4 & 1/2″ and the design is approximately 3 & 3/4″ x 4″.