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Herbs or shrubs; leaves simple, entire, opposite with stipules, or verticillate, usually turning black in drying.

Most of the species are North American herbs, having opposite, alternate, or verticillate leaves.

Leaves 1 to 2 in. long, very sharply acute, pale green color, spreading, 4-sided, straight, rigid, slightly glaucous beneath; branches horizontal; branchlets remotely verticillate, numerous, drooping, with light-colored bark.

Growth of wood and fruit emanating from the nodes; buds, branchlets and cones, therefore, in verticillate association.

Cells of the same number as the styles, verticillate, with solitary seeds.