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 SaguaroCarnegiea gigantea The saguaro [suh gwah'rO] is the largest cactus of the United States, standing up to 50 feet tall and weighing as much as 10 short tons. It is also one of the longest-living plants in the world, with 200-year-old specimens not being uncommon. It grows only in the foothills and deserts of southern Arizona, southeastern California, and northwestern Mexico. Within its range, however, it can be extremely abundant, forming thick forests among other desert trees and shrubs.
Padlike structures called areoles grow along the ribs. Each areole has from 15 to 25 long spines. During May and June, the areoles near the tip of the trunk and branches produce waxy, greenish-white flowers. Each funnel-shaped flower measures 3 to 4 inches long, and blooms at night. Bats, birds, and insects gather nectar from saguaro blossoms and, during the process, spread pollen from flower to flower. The pollinated flowers may then produce purplish-red, egg-shaped fruit. Many desert creatures eat this fruit. Saguaros also provide habitat for several animals. The most conspicuous of these is the Gila woodpecker, which creates many of the nest holes seen in mature saguaro stems. The flower of the Saguaro cactus is the State Flower of Arizona. Scientific Classification division Magnoliophyta Questions or comments about this page?
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The saguaro has a columnlike trunk that measures
from 1 to 2½ feet in diameter. It also has a few large,
upturned branches. Grooves and ribs run lengthwise along
both the trunk and branches. Because little rain falls in
the region where saguaros grow, the plant must soak up
and store large amounts of water after the rare showers
that do occur. The grooves and ribs expand and contract
depending on the amount of stored water.