Wettstein System - Gymnospermae

1. subdivisio Gymnospermae

1. classis Pteridospermae (fossil only)

2. classis Cycadinae

1. familia Cycadaceae

2. familia Zamiaceae

3. classis Benettitinae (fossil only)

4. classis Cordaïtinae (fossil only)

5. classis Ginkgoinae

1. familia Ginkgoaceae

6. classis Coniferae

1. familia Taxaceae

2. familia Cupressaceae

3. familia Abietaceae

7. classis Gnetinae

1. familia Ephedraceae

2. familia Gnetaceae

3. familia Welwitschiaceae

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