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- Wahlbergella drummondii (Hook.) Rydb., See Silene drummondii Hook. var. drummondii
- Wahlbergia Fries., See Silene L.
- Wallia cinerea (L.) Alef., See Juglans cinerea L.
- Wallia nigra (L.) Alef., See Juglans nigra L.
- Washingtonia claytonii (Michx.) Britton, See Osmorhiza claytonii (Michx.) C.B. Clarke
- Washingtonia divaricata Britton, See Osmorhiza berteroi DC.
- Washingtonia longistylis (Torr.) Britton, See Osmorhiza longistylis (Torr.) DC.
- Washingtonia obtusa Coult. & Rose, See Osmorhiza depauperata Phil.
- Washingtonia Raf., See Osmorhiza Raf.
- Wendlandia Willd., See Cocculus DC.
- Windsoria sesleroides Michx., See Tridens flavus (L.) A.S. Hitchc.
- Wolffia borealis (Engelm. ex Hegelm.) Landolt ex Landolt & Wildi
- Wolffia brasiliensis Weddell
- Wolffia columbiana Karst.
- Wolffia papulifera Thomps., See Wolffia brasiliensis Weddell
- Wolffia punctata auct. non Griseb., See Wolffia borealis (Engelm. ex Hegelm.) Landolt ex Landolt & Wildi
- Wolffia Horkel ex Schleid.
- Woodsia ilvensis (L.) R. Br.
- Woodsia mexicana Fee , See Woodsia neomexicana Windham
- Woodsia neomexicana Windham
- Woodsia obtusa (Spreng.) Torr.
- Woodsia obtusa Torr., See Woodsia obtusa (Spreng.) Torr.
- Woodsia oregana D.C. Eat.
- Woodsia scopulina D.C. Eaton
- Woodsia R. Br.
- Wulfenia bullii (Eat.) Barnh., See Besseya bullii (Eat.) Rydb.
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