Family: Cupressaceae

Thuja occidentalis
Thuja occidentalis   L.  -  Arbor-vitae
Photo © by Brooklyn Botanic Garden
Taken by G. A. Kalmbacher.

By Steven D. Glenn

Not peer reviewed

Last Modified 01/18/2012

Key to the genera of Cupressaceae

1. Leaves linear, alternate, 7 mm in length or longer, divergent; cone scales spiral...2
1. Leaves scale-like, opposite or whorled, less than 7 mm in length, usually appressed; cone scales opposite...3

2. Leaves alternate in a flat plane, straight, distal half divergent from stem...Taxodium
2. Leaves spirally alternate, curved, distal half parallel to stem...Cryptomeria

3. Cone berry-like or drupe-like, somewhat fleshy...Juniperus
3. Cone woody or leathery...4

4. Cone globose, the scales peltate, not overlapping...Chamaecyparis
4. Cone oblong-ovoid, the scales overlapping...Thuja

List of Cupressaceae Genera

References to Cupressaceae

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  • Adams, R. P. 2000. Systematics of Juniperus section Juniperus based on leaf essential oils and random amplified polymorphic DNAs (RAPDs). Biochem. Syst. Ecol. 28: 515-528.
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