Chollas are botanically in the subfamily of Opuntioideae, the same family which includes cactus’s with broad, flat leaves. The leaves of the Cholla are round-ish and really spiny. They quickly become stuck to any object that comes close to it. Their spines hurt and aren’t easy to remove once impaled in either fabric, fur or flesh. When backlit by the setting sun, their branches look like bright torches of white gold.