Cupressaceae image
Kenneth J. Sytsma  
1a. Mature female cones fleshy and berry-like, bluish, the scales fused; leaves opposite or whorled, needle-like, or scale-like but not keeled, the branchlets quadrangular ... Juniperus
1b. Mature female cones woody, brown, the scales distinct; leaves opposite and appressed, scale-like, one pair strongly keeled at right angles to an adjacent pair of flat leaves, the branchlets strongly flattened... Thuja
Species from our two genera are often cultivated and while white cedar sometimes escapes outside its native range, no non-native species of junipers have ever been found in the wild in Wisconsin.