The Monument is home to twenty-six species of cacti, including its namesake, the organ pipe cactus. More than seventy-five miles of accessible vehicle roads wind through two, distinct habitat zones of the Sonoran Desert – the hotter and drier lower Colorado zone and the more luxuriant Arizona upland, depicted in this exhibit. The Monument is located in southern-most central Arizona. To its east lies the Tohono O’Odham Indian Reservation. To the west is Cabeza Prieta National Wildlife Refuge – 860,000 acres of wild, rugged Sonoran Desert, accessible only by four-wheel-drive vehicle and special permit. In 1976, the United Nations designated Organ Pipe Cactus National Monument an international Biosphere Reserve for its unique family of wildlife and plants.
Link to Organ Pipe Cactus National Monument

Like to Cabeza Prieta National Wildlife Refuge

The Audubon Society Field Guide to North American Wildflowers, Western Region, Alfred A. Knopf, 1979.

A Field Guide to the Plants of Arizona, Anne Orth Epple and Lewis E. Epple, Falcon Press Publishing, 1995.

Peterson Field Guides, Western Birds, Roger Tory Peterson, Houghton Mifflin Company, 1990.
organ pipe cactus national monument
copyright notice

All rights are reserved. All images are Copyright © David Tubbs (except where indicated). Using images from this website for any purpose is unlawful without prior licensing agreement made by the photographer. The content of thegreensignature.com is Copyright ©2007-2009 David Tubbs and may not be reproduced or used without prior written permission.