section Juniperus
Adult leaves needle-like, in whorls of three, and jointed at the base.

subsection Juniperus:
Cones with 3 separate seeds;
Needles with one stomatal band.

subsection Caryocedrus:
Cones with 3 seeds fused together;
Needles with two stomatal bands.

Sabina: Scale-leaf junipers.
The adult leaves are mostly scale-like, similar to those of Cupressus species, in opposite pairs or whorls of three, and the juvenile needle-like leaves are not jointed at the base (including in the few that have only needle-like leaves; see below right). Provisionally, all the other junipers are included here, though they form a paraphyletic group. (From Wikipedia)

Old World species

New World species