W

1. Wallacea - 3

2. Walleria - 3

3. Warrea - 3

4. Washingtonia - 3

5. Wendlandiella - 3

6. Wettsteinia - 3

7. Wettsteiniola - 3

8. Weymouthia - 3

9. Wiesneria - 3

10. Willemetia - 3

11. Winklera - 3

12. Wislizenia - 3

13. Woodia - 3