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Genera in alphabetic order (with number of investigated species)
- Wachendorfia (1)
- Waldsteinia (1)
- Watsonia (1)
- Weigela (3)
- Welwitschia (1)
- Werauhia (5)
- Whitfieldia (3)
- Willemetia (1)
- Wisteria (1)
- Wittmackia (3)
- Wittrockia (3)
- Wrightia (2)
- Wulfenia (2)