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Zones of aquatic vegetation
Zonation of Picea engelmanni and Salix pseudolapponum (Salix glauca)
Zonal distribution of sand shore vegetation
Zonal distribution, border of meadow
Zizia in a Minnesota lake
Zizia cordata
Zizia aurea, Anemone canadensis, and Thalictrum dioicum
Zizia aurea, Anemone canadensis, and Thalictrum dioicum
Zizia aurea
Zizania aquatica
Zigadenus elegans
Zea mays
Zanthoxylum americanum
Zamia
Zamia
Yuccca glauca
Young birches in spring
Yellow lady-slipper
Xyris flexuosa (Xyris caroliniana)
Xylaria polymorpha
Xerophytic fern (Polypodium serpens)
Xanthium canadense
Wye English Garden, Agricultural College
Woodsia obtusa
Woodsia obtusa
Woodsia ilvensis
Witch's broom on Larix
Witch's broom on Larix
Witch's broom on junipers
Witch's broom on junipers
Witch's broom on junipers
Witches broom on Spruce
Witches broom on Pinus strobus (Strobus strobus)
Witches broom on Pinus strobus (strobus strobus)
Witches broom on balsam fur
Witches broom on balsam fir
Witches broom on balsam
Witches broom on balsam
Witches broom on balsam
Wisteria frutescens
Winter vegetation on the banks of the Mississippi.
Winter vegetation
Winnebago Valley, no. 5 of series
Winnebago Valley, no. 4 of series of S.E. Views, S.W. view
Winnebago Valley, no. 3 of series of S.E. views, S. view
Winnebago Valley, no. 2 of a series of S.E. views
Winnebago Valley, no. 1 of a series of S.E. views
Winnebago Valley
Winnebago Valley
Winnebago Creek from high road