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Zygadenus
Zygadenus
Zygadenus
Zones of aquatic vegetation
Zonation of Picea engelmanni and Salix pseudolapponum (Salix glauca)
Zonation of floating bog
Zonal distribution on the border of a meadow, Hordeum in the foreground
Zonal distribution of sand shore vegetation
Zonal arrangement of algae in Friendly Cove
Zizia in a Minnesota lake
Zizia cordata
Zizia cordata
Zizia
Zizania with sagitaria in foreground
Zizania palustris (Zizania aquatica)
Zizania palustris (Zizania aquatica)
Zizania aquatica
Zizania
Zea mays in flower
Zea mays
Zanthoxylum leaf
Zamia
Yuccca glauca
Yucca in the desert in Southern California
Yucca in flower
Yucca glauca in Billings, Montana
Yucca glauca, cactus, and sage brush in Billings, Montana
Yucca cactus in the desert in Southern California
Yucca arborescens (Yucca brevifolia)
Young Vireos warbling, double exposure
Young Trees on a fallen log by the trail near camp
Young Night Hawks on Rocks where they hatched
Young forest on the North Shore looking west from Palisade Head
Young Bull Moose, near view
Young Bull Moose
Young Blue Heron near nest, sixty feet above the ground
Young Birch Forest at Itasca State Park
Young birches in spring
Young beaver on end of dam near Rice Lake
Young beaver on end of dam near Rice Lake
Yellow Water Lily
Yellowstone Lake and the Fish Cone
Yellow Pond Lily, near view
Yellow Lady Slippers and Ferns
Yellow Lady Slipper, nearer view
Yellow Lady Slipper, large
Yellow Lady Slipper and Ferns
Yellow lady-slipper
Yellow Birch trunk and bark
Yellow Birch trunk and bark
Yellow Bellwort
Yellow Bellwort
Yellow Bellwort
Yellow Bellwort
Yellow Adder's Tongue and Snow Lily
Xerophytic fern (Polypodium serpens)
Xanthium strumatium
Xanthium echinatum (Xanthium strumarium)
Xanthium canadense
Wye English Garden, Agricultural College
Woosdia ilvensis
Wool Sower Gall on Quercus alba
Woolly Leaf Gall of Quercus coccinea
Woodsia scopulina on cliffs
Woodsia obtusa
Woodsia obtusa
Woodsia ilvensis
Woodsia ilvensis
Woodsia ilvensis
Woodsia ilvensis
Woodsia ilvensis
Woodsia ilvensis
Woodsia catheartiana
Woodsia and bluebells on a rock cliff
Wood Lily
Woodland trail at Itasca State Park
Woodland trail at Itasca State Park
Woodland trail at Itasca State Park
Woodland trail at Itasca State Park
Wooded shore of Clearwater Lake in the Gunflint region
Woodbine on Birch tree
Woodbine leaf
Woman holding Pteris, ten feet, seven inches tall, with women and men looking
Wolffia columbiana
Wolfberry leaf and fruit
Wolfberry leaf and fruit
"Witch's Broom" Bud twig gall of Celtis
"Witch's Broom" Bud twig gall of Celtis
Witch Hazel
Witches broom on Pinus strobus (Strobus strobus)
Witches' Broom on Hemlock
Witches broom, Gall of Celtis, nearer view
Witches broom, Gall of Celtis
Wisteria frutescens
Winter vegetation on the banks of the Mississippi.
Winter vegetation
Winter Rosette, Verbascum thlapsus
Winter Rosette, Taraxacum
Winter Rosette, Saxigraga pensylvanica (Micranthes pensylvanica)
Winter Rosette, Potentilla monspeliensis (Potentilla norvegica)