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Flora of the Mojave Desert region : ウィキペディア英語版 | Flora of the Mojave Desert region
The flora of the Mojave Desert help define what is called the Mojave Desert in that the desert itself is generally considered to be outlined by the extent of growth of one of its plants, the Joshua Tree (''Yucca brevifolia''). Mojave Desert flora is not a vegetation type, although plants in the area have evolved in isolation because of physical barriers. This area includes southeastern California and smaller parts of central California, southern Nevada, southwestern Utah and northwestern Arizona in the United States. The flora are adapted to extremely hot and dry conditions, but generally not as extreme as the adaptations needed for survival in the flora of the Sonoran Desert, which has an overlap in its major flora, such as the creosote bush (''Larrea tridentata''). ==Physical conditions affecting flora== The Mojave Desert is diverse in topography, climates, and soil types, leading to a variety of recognized vegetation types. Flora within each vegetation type may overlap with other vegetation types, and with flora of the Sonoran Desert. Fine clays from erosion and decomposition of rocks, starting at the surrounding mountains, collect at the lowest areas. This is because the finer particles are more readily transported than the larger crystals, leading to dark colored clays at lower elevation, and lighter and more course grained sand crystals at higher elevations. There are two periods with enough precipitation for general germination, winter-spring, and in late summer monsoons. Plants germinating in the late summer monsoons are less well studied. The physical conditions in the Mojave Desert are widely varying. These conditions create recognized vegetation types, sometimes including Pinyon-juniper woodland, Joshua tree woodland, Sagebrush scrub, Blackbush scrub, creosote bush scrub, Saltbush scrub, Shadscale scrub, Desert dry wash, and lush Desert riparian.
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