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Britton & Rose
(Engelm.) Britton & Rose
|Natural range of Carnegiea gigantea|
The saguaro (//) (Carnegiea gigantea) is an arborescent (tree-like) cactus species in the monotypic genus Carnegiea, which can grow to be over 20 m (70 ft) tall. It is native to the Sonoran Desert in Arizona, the Mexican State of Sonora, and the Whipple Mountains and Imperial County areas of California. The saguaro blossom is the state wildflower of Arizona. Its scientific name is given in honor of Andrew Carnegie.
Saguaros have a relatively long lifespan. They may grow their first side arm any time from 75–100 years of age, but some never grow one at all. A saguaro without arms is called a spear.
The arms are grown to increase the plant's reproductive capacity (more apices lead to more flowers and fruit). The growth rate of saguaros is strongly dependent on precipitation; saguaros in drier western Arizona grow only half as fast as those in and around Tucson, Arizona. Some specimens may live for more than 150 years; the largest known saguaro is the Champion Saguaro growing in Maricopa County, Arizona, and is 13.8 m (45.3 ft) tall with a girth of 3.1 m (10 ft). These cacti can grow from 40 to 60 ft tall. They grow slowly from seed, and never from cuttings. Whenever it rains, saguaros soak up the rainwater. The cactus will visibly expand, holding in the water. It conserves the water and slowly consumes it.
The spines on saguaro having a height less than 2 m grow rapidly, up to a millimeter per day. When held up to the light or bisected, alternating light and dark bands transverse to the long axis of spines can be seen. These transverse bands have been correlated to daily growth. In columnar cacti, spines almost always grow in areoles which originate at the apex of the plant. Individual spine growth reaches mature size in the first season and then ceases to grow. Areoles are moved to the side and the apex continues to grow upwards. Thus, the older spines are towards the base of a columnar cactus and newer spines are near the apex. Current studies are underway to examine the relationship of carbon and oxygen isotope ratios in the tissues of spines to the past climate and photosynthetic history of the plant (acanthochronology).
The night-blooming white and yellow flowers appear April through June and the sweet, ruby-colored fruit mature by late June. Saguaro flowers are self-incompatible, thus require crosspollination. Large quantities of pollen are required for complete pollination as there are numerous ovules. A well-pollinated fruit will contain several thousand tiny seeds.
The flowers open well after sunset and remain open till mid-afternoon of the next day. They also continue to produce nectar after sunrise. Saguaros have a redundant pollination system, i.e. full fruit set is possible even if only a fraction of the pollinating species are present. Main pollinators are honey bees, bats and white-winged doves. In most years diurnal visitors are the main contributors for fruit set, with the highest proportion on honey bees.
Main nocturnal pollinator is the Lesser Long-nosed Bat, feeding on the nectar. A number of floral characteristics are geared toward bat pollination: nocturnal opening of the flowers, nocturnal maturation of pollen, very rich nectar, position high above the ground, durable blooms that can withstand a bat's weight, and fragrance emitted at night. One additional piece of evidence is that the amino acids in the pollen appear to help sustain lactation in bats.
Other diurnal visitors are birds like the Costa's hummingbird, Black-chinned hummingbird and Broad-billed hummingbird, the Hooded oriole and Scott's oriole, the Gila woodpecker and Gilded flicker, the Verdin and the House finch.
The ruby red fruits are 6–9 cm long and ripen in June. Each fruit contains around 2000 seeds plus sweet fleshy connective tissue. The fruits are edible and prized by local people.
The fruits cannot be picked by hand, but must be harvested using a pole (often a saguaro rib) 2 to 5 m long, to the end of which is attached another pole.
The O'odham tribes have a long history of saguaro fruit use. The Tohono O’odham tribes celebrate the beginning of their summer growing season with a ceremony using a fermented drink made from the bright red fruit to summon rains, vital for the crops.
Native birds such as Gila woodpeckers, purple martins, house finches, and gilded flickers live inside holes in saguaros. Flickers excavate larger holes higher on the stem. The nest cavity is deep, the parents and young entirely hidden from view. The saguaro creates callus tissue on the wound. When the saguaro dies and its soft flesh rots, the callus remains behind as a so-called "saguaro boot", which was used by natives for storage.
The Gila woodpeckers (Melanerpes uropygialis) create new nest holes each season rather than reuse the old ones, leaving convenient nest holes for other animals, such as elf owls, flycatchers, and wrens. In recent years, early-breeding, aggressive, non-native birds have taken over the nests to the detriment of elf owls that breed and nest later.
Harming a saguaro in any manner, including cactus plugging, is illegal by state law in Arizona, and when houses or highways are built, special permits must be obtained to move or destroy any saguaro affected. There are exceptions to this general understanding. For example, a private landowner whose property is ten (10) acres or less, where the initial construction has already occurred, may remove a saguaro from the property. This is common when the cactus falls over in a storm, its location interferes with a house addition, or it becomes a potential hazard to humans. Specifically, Arizona Revised Statutes, A.R.S. 3-904.(H) defines this exemption.
- The saguaro is an important source of food and shelter for the Tohono O’odham. Saguaro spines are sometimes used as sewing needles and the ribs are used to make harvesting tools.
- The ribs of the saguaro were used for construction and other purposes by Native Americans. A fine example can be seen in the roofing of the cloisters of the Mission San Xavier del Bac on the Tohono O'odham lands near Tucson.
- The Seri people of northwestern Mexico used the plant, which they call mojépe, for a number of purposes.
The saguaro is often used as an emblem in commercials and logos that attempt to convey a sense of the Southwest, even if the product has no connection to Arizona or the Sonoran Desert. For instance, no naturally occurring saguaros are found within 250 miles (400 km) of El Paso, Texas, but the silhouette is found on the label of Old El Paso brand products. Though the geographic anomaly has lessened in recent years, Western films once enthusiastically placed saguaros in Monument Valley of Arizona, as well as New Mexico, Utah, and Texas. There are no wild saguaros anywhere in Texas, Colorado, Utah, New Mexico, or Nevada, nor in the high deserts of northern Arizona.
Needles of a saguaro, Paradise Valley, AZ
Saguaro flowers, Scottsdale, Arizona
Unusually formed saguaro near Kino Bay, Sonora
- Burquez Montijo, A., Butterworth, C., Baker, M. & Felger, R.S. (2013). Carnegiea gigantea. The IUCN Red List of Threatened Species. Version 2014.2.
- "Carnegiea gigantea (Engelm.) Britton & Rose". Tropicos. Missouri Botanical Garden. Retrieved 2014-09-19.
- "Life Cycle of the Saguaro" (PDF). Arizona-Sonora Desert Museum. 2008. Retrieved 2013-12-04.
- English, N. B.; Dettman, D. L.; Sandquist, D. R.; Williams, D. G. (2007). "Past climate changes and ecophysiological responses recorded in the isotope ratios of saguaro cactus spines". Oecologia 154 (2): 247. doi:10.1007/s00442-007-0832-x.
- Theodore H. Fleming: Sonoran desert columnar cacti and the evolution of generalized pollination systems. In: Ecological Monographs. Band 71, Number 4, 2001, pp. 511–530, JSTOR.
- Theodore H. Fleming: Sonoran desert columnar cacti and the evolution of generalized pollination systems. In: Ecological Monographs. Band 71, Number 4, 2001, pp. 517–518, JSTOR.
- A Natural History of the Sonoran Desert, Edited by Steven J Phillips and Patricia Comus, University of California Press, Berkeley, 2000, p. 193
- Mark Elbroch; Eleanor Marie Marks; C. Diane Boretos (2001). Bird tracks and sign. Stackpole Books. p. 311. ISBN 0-8117-2696-7.
Cavities in saguaro cactuses in the Southwest are common. Both gilded flickers and gila woodpeckers make these cavities for nesting but they often choose different locations on the cactus. The stouter bills of the gilded flickers allow them to cut cavities through the wooden ribls near the top of the cactus where the ribs converge. Gila woodpeckers stay at midlevel on the cactus where the ribs are separated enough to cut a cavity between them. Cavities in saguaros are cut out by these birds the year before they are inhabited. The excavated cactus secretes a fluid that hardens into a scab, thus preventing water loss, which could kill the cactus, as well as waterproofing the inside of the next cavity.
- "Gila woodpecker". Nature Conservancy. Retrieved 2011-01-24.
Although they do not use them immediately, waiting first for the sap to harden, Gila woodpeckers excavate cavities in cacti and trees as nesting sites. Females typically lay two broods a year of three to five eggs, which incubate for 14 days. Once abandoned, the cavities are occupied by reptiles, rodents, and small birds like kestrels, elf owls, flycatchers and wrens. In the desert, the woodpeckers perform the important ecological function of removing unhealthy flesh from the saguaro cactus. Some insects on which it feeds carry diseases, harmless to the bird, which damage the cactus and leave discolorations. The marks signal larvae to the bird, and as it excavates the insects, it also cuts away the diseased tissue. As the sap hardens, the cactus is healed, and the excavation becomes a convenient nesting site.
- "Article 11: Arizona Native Plants". Arizona Department of Agriculture.
- Benson, L. (1981). The Cacti of Arizona. University of Arizona Press. ISBN 0-8165-0509-8.
- Felger, Richard; Mary B. Moser. (1985). People of the desert and sea: ethnobotany of the Seri Indians. Tucson: University of Arizona Press.
- Drezner TD (2005) Saguaro (Carnegiea gigantea, Cactaceae) growth rate over its American range and the link to summer precipitation. Southwest Nat 50:65–68.
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