Hibiscus Flower?

No this not a hibiscus flower.  But it sure looks like one.  This pic was taken from the Whiskey Barrel cacti collection at El Presidio in April.  A variety of Opuntia known as the Engelmann Prickly Pear.  This cactus is cool with or without the flower.  I love the long needles and purple hue of the pad.

The Engelmann Prickly Pear taken in April.