Flora of the Arizona Upland

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.[1]

Evolutionary history

Environmental influences

The Arizona Upland receives between 12 and 15 inches of annual precipitation, of which half falls in the summer monsoons.[1] Cold air collects in the valleys.[1] Less cold tolerant species grow on the warmer slopes above.[1]

Characteristics

The flora of the Arizona Upland is characterized by a rich association of large and small cacti and succulents, trees, shrubs, perennials and annuals.[1] Plants must be frost tolerant, which distinguishes the flora from that of adjacent areas of the Sonora Desert.[1]

Taxa and diversity

Cacti and succulents

Cactaceae Family members include the tall Saguaro (Carnegiea gigantea) on warmer slopes above the valleys.

Following rains, Ocatillo (Fouquieria splendens) adds bright red flowers high up on the tips of multiple tall stems rising from the base.[1]

Trees

There are extensive stands of Velvet Mequite (Prosopis velutina), in the Legume Family (Fabaceae).[1]

Woody shrubs

Perennials

Annuals

Ecology
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gollark: It can generate ~100MHz square waves and you can connect up an antenna, which is *basically* what a radio transmitter would do but stupider and worse.
gollark: Yes, a clock or something.
gollark: A quirk of the raspberry pi means it can transmit FM radio with horrible interference because it can only broadcast square waves or something, because of happening to have a somewhat adjustable ~100MHz clock exposed on external pins or something.
gollark: Technically I *could* transmit FM radio. Also technically, I can't transmit it at any significant power and doing so would be illegal.

References
  1. Sonoran Desert Wildflowers, Richard Spellenberg
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