Is the fruit 1/8 - 1/4" in diameter, maturing in 1 year; the foliage gray-green?
CLUE: the tree is native to the Southwest and Mexico.
It is a one-seed juniper.
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Is the fruit 1/4 - 3/4" in diameter, maturing in two years; the foliage light yellow-green?
CLUE: the tree is native to the inland West south to central Arizona.
It is a Utah juniper.