George Sanker / Cottonwood trees (Populus sargentii) on the Lamar River, Yellowstone National Park, Wyoming, USA, October 2011

Pascal Tordeux / Poplar (Populus) trees in snow. Picardie, France December.

Gary K. Smith / Black Poplar (Populus serotina) hybrid plantation. Suffolk, England, May.

Jose B. Ruiz / White poplar trees {Populus alba} growing beside a river, winter, Ruidera NP, Spain

Jose B. Ruiz / White poplar trees {Populus alba} growing beside a river, winter, Spain

MYN / Niall Benvie / Balsam poplar {Populus gileadensis} leafing out, Angus, Scotland , UK meetyourneighbours.net project

MYN / Niall Benvie / Balsam poplar {Populus gileadensis} leafing out, Angus, Scotland, UK meetyourneighbours.net project

MYN / Niall Benvie / Balsam poplar {Populus gileadensis} leafing out, Angus, Scotland, UK meetyourneighbours.net project

Jose B. Ruiz / Silhouette of Poplar tree with night sky, moon and stars. San Martin de trevejo, Las Hurdes, Caceres, Extremadura, Spain.

Jose B. Ruiz / Poplar {Populus} trees at night with star trails, Torrecilla de los Angeles, Las Hurdes, Caceres, Extremadura, Spain

Philippe Clement / Balsam poplar / Black cottonwood trees {Populus balsamifera} in autumn colours, Denali NP, Alaska, USA