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Pediocactus sileri
''Pediocactus sileri'' is a rare species of cactus known by the common names Siler's pincushion cactus and gypsum cactus (or gypsum plains cactus). It is native to southwestern Utah and northwestern Arizona in the United States. It is limited to a specific type of soil, individuals are often spaced far apart, and the species is threatened by a number of human activities such as off-road vehicle use, poaching, and uranium mining.〔(''Pediocactus sileri''. ) The Nature Conservancy〕 This is a federally listed threatened species of the United States.
==Description==
This cactus is egg-shaped or sometimes cylindrical in shape, and may have short branches. It is up to 25 centimeters tall by about 11 wide. The surface is bumpy with areoles which are covered in hairs or woolly fibers. Each areole has 3 to 7 main spines which are black to gray or white in color, those occurring near the base of the cactus body reaching up to 3 centimeters long. Each areole also has many smaller white spines 1 or 2 centimeters long. Spines around the base of the cactus may help to anchor it to the soil. The cactus flowers in April and May. The flower is up to 2 centimeters long by 3 wide and has white-margined brown outer tepals and purple-veined yellow inner tepals. The fruit is yellow-green in color and just over a centimeter long.〔(''Pediocactus sileri''. ) Flora of North America.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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