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DistributionSoaptree yucca occurs in central Arizona, southern New Mexico, western Texas [2,8], and Coahuila and Chihuahua, Mexico . The PLANTS database provides a distributional map of soaptree yucca in the United States. The typical variety occurs from central Arizona east to southwestern Texas; it is the only variety native to Mexico . Utah yucca occurs from Nevada east to southwestern Arizona and south to north-central Arizona. Verdi yucca is known only in central Arizona [4,24,49].