Cacti
Our namesake, the organ pipe cactus, is rarely found in the US NPS Volunteer Cacti of the Monument There are 28 different species of cacti in the monument, ranging from the giant saguaro to the miniature pincushion. These cacti are all highly adapted to survive in the dry and unpredictable desert. They use spines for protection and shade, thick skin and pulp to preserve water, unique pathways of photosynthesis at night, and hidden under their skin are delicate to sturdy wooden frames holding them together. Day or night, the summer display of many different cactus blooms is one of the desert's flashiest spectacles, as the brilliant flowers of yellow, red, white, and pink bring color to the landscape. It is a show upstaged only by the springtime explosions of gold poppies, blue lupines, pink owl clover, and other annuals after a wet winter. 
The Organ Pipe cactus opens its blossoms only during the cooler evening hours, for one night only, closing early in the morning. Andy Fisher, NPS photo The more common cacti species found within Organ Pipe Cactus National Monument include:
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Did You Know?
It's not easy, practical, or legal to get "water" from a barrel cactus within the Monument. Even if you tried to get past the spines, it would be like sucking on a bad-tasting dish sponge. The best thing to do is fill a canteen with good drinking water before leaving home.