Asian Watermeal
Wolffia globosa
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Wolffia globosa
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Wolffiella lingulata
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Wolffiella oblonga
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Woodsia oregana
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Woodsia plummerae
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Woodsia scopulina
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Woodwardia fimbriata
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Wyethia angustifolia
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Wyethia bolanderi
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Wyethia elata
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Wyethia glabra
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Wyethia helenioides
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Wyethia invenusta
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Wyethia longicaulis
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Wyethia mollis
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Wyethia ovata
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Wyethia reticulata
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Xanthisma gracile
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Xanthisma junceum
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Xanthisma spinulosum
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Xanthisma spinulosum var. gooddingii
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Xanthium orientale
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Xerophyllum tenax
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Xylococcus bicolor
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Xylorhiza cognata
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Xylorhiza orcuttii
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Xylorhiza tortifolia
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Xylorhiza tortifolia var. tortifolia
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Yabea microcarpa
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Yorkia unguiculata 'Mountain Garland White'
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Yucca baccata
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Yucca baccata var. baccata
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Yucca brevifolia
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Yucca schidigera
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Zannichellia palustris
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Zeltnera davyi
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Zeltnera exaltata
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Zeltnera muehlenbergii
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Zeltnera namophila
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Zeltnera trichantha
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Zeltnera venusta
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Ziziphus obtusifolia
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Ziziphus obtusifolia var. canescens
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Ziziphus parryi
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Ziziphus parryi var. parryi
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Zostera marina
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Zostera pacifica