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91. scarce and mainly disappear before we reach Whitewater and are replaced by Opuntia arborescens, grass & various small plants. A few Yucca radiosa still scatter along & cling to south slopes up nearly to Silver City. Nolina and juniperus polyploid and oaks appear on the north slopes of the ridges. The break from lower to upper Sonoran comes between Faywood & White Water in the open valley, though the steep south slopes above carry traces of Lower Sonoran higher up.