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Leaves are all needle-like, 3-15 mm (1/8 - 5/8 in.) long, and are in whorls of 3 - Ground juniper (Juniperus communis ssp. depressa)
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Leaves are mostly scale-like, 1-3 mm (1/32 - 1/8 in.) long, and are in opposite pairs (young trees, and some lower branches of larger trees, with whorled, needle-like leaves)