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The Sonoran Desert. The Sonoran Desert is a North American desert and ecoregion which covers large parts of the southwestern United States and of northwestern Mexico. With an area of 260,000 square kilometers (100,000 sq mi), it is the hottest desert in Mexico. The western portion of the Mexico–United States border passes through the Sonoran ...
Arizona—Sonora Desert Museum: Flora of the Sonoran Desert Region; U.S. Wildflowers Reference List: Arizona — Reference List of websites for Arizona Wildflower Identification. Pima Community College. Common Wildflowers of Tucson. Floras - Arizona Native Plant Society
Plants must survive its hot and dry conditions. [2]: 7 Temperatures can be greater than 120 °F (49 °C). [2]: 7 Annual precipitation is sometimes less than 3 inches (7.6 cm). [2]: 7 Density of vegetation gradually diminishes moving from the Arizona Upland into the Colorado Desert proper. [2]: 7
Flowers grow 8.6–12.4 cm (3.4–4.9 in) long, and are open for less than 24 hours. Since they form only at the top of the plant and the tips of branches, saguaros growing numerous branches is reproductively advantageous. Flowers open sequentially, with plants averaging four flowers open per day over a bloom period lasting a month. [7]
Desert Botanical Garden is a 140-acre (57 ha) botanical garden located in Papago Park, at 1201 N. Galvin Parkway in Phoenix, central Arizona.. Founded by the Arizona Cactus and Native Flora Society in 1937 [1] and established at this site in 1939, the garden now has more than 50,000 plants in more than 4,000 taxa, one-third of which are native to the area, including 379 species which are rare ...
The flowers only appear on the very top of the plant. As the flowers begin to wilt in early May, they may change color. A late summer desert rainstorm can produce a late bloom, as shown in the photograph below of the orange-flowered variety (it bloomed two days after a hurricane in mid-August and continued to bloom through the end of September).
Peniocereus greggii with fruit in Sahuarita, Arizona. This cactus has stems about 1/2-1 inch wide with 6–9 edges. Its flowers are white, up to 30 centimetres in diameter with a scent redolent of vanilla. The flowers open after sundown, closing and wasting after a few hours. By 9 am the next day they are gone.
Flora of the Arizona Upland includes higher elevation Sonora Desert plants that require more moisture and cooler climates than those of the adjacent Sonoran Desert areas in the Colorado Desert of the lower Colorado River valley area, and which can withstand frost, unlike plants of the Sonoran Desert south of the border between the United States and Mexico.