Floris van Breugel / Aspen (Populus tremula) trees in autumn colours, North Fork of Bishop Creek, near Bishop, Eastern Sierra, California, USA
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Tim Fitzharris / Cottonwood (Populus sp) trees in autumn near Maroon Bells, Colorado
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George Sanker / Cottonwood trees (Populus sargentii) on the Lamar River, Yellowstone National Park, Wyoming, USA, October 2011
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Colin Monteath / Willow (Salix sp) and Cottonwood (Populus sp) trees in fall colors with Lake Pukaki and Mount Cook, Mackenzie Country, South Canterbury, New Zealand
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Donald M. Jones / Great Horned Owl (Bubo virginianus) in cottonwood tree, western Montana
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Philippe Clement / Tulip tree / Tulip poplar / Yellow poplar (Liriodendron tulipifera) leaf in autumn colours, native to eastern North America
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Philippe Clement / Parkland in autumn with Beech tree (Fagus sylvatica) and Tulip tree / Yellow poplar (Liriodendron tulipifera) Nobvember, Belgium
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GEORGETTE DOUWMA / Flower of Tulip tree / Yellow poplar (Liriodendron tulipifera) The tallest hardwood tree in eastern North America. USA
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GEORGETTE DOUWMA / Flower of Tulip tree / Yellow poplar (Liriodendron tulipifera)
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GEORGETTE DOUWMA / Flower of Tulip tree / Yellow poplar (Liriodendron tulipifera) The tallest hardwood tree in eastern North America. USA
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GEORGETTE DOUWMA / Tulip tree / Yellow poplar (Liriodendron tulipifera) The tallest hardwood tree in eastern North America. USA
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Tim Fitzharris / Cottonwood (Populus sp) frozen leaves, North America
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Rob Tilley / Quaking Aspen Grove {Populus tremuloides} in autumn, Colorado, USA
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Rob Tilley / Quaking Aspen Grove {Populus tremuloides} in autumn, Colorado, USA
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George McCarthy / Aspens (Populus tremula) with yellow coloured autumn leaves, Grand Teton National Park, Wyoming, USA
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George McCarthy / Aspen Tree (Populus tremula) with golden autumn fall leaves, Grand Teton National Park, Wyoming, USA
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Tim Fitzharris / Maple (Acer sp) and Cottonwood (Populus sp) trees in autumn, Zion National Park, Utah
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Tim Fitzharris / Oak (Quercus sp), Cottonwood (Populus sp) and Willow (Salix sp) leaves in fall colors
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Tim Fitzharris / Cottonwood (Populus sp) trees, fall foliage, Carson Valley, Nevada
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Tim Fitzharris / Maple (Acer sp) and Cottonwood (Populus sp) autumn foliage, Zion National Park, Utah
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Tim Fitzharris / Cottonwood (Populus sp) trees, fall foliage, Carson Valley, Nevada
