Grant Wood, 1917, The Shaking Poplar (Populus tremuloides, aka quaking aspen. The state tree of Utah. Canada and the US west; Populus grandidentata is the aspen in the US upper midwest, lower Ontario and Quebec etc.) The counterchange on the trunk stands out, but oddly light against light & dark against dark.

Populus grandidentata, the bigtooth aspen or Canada aspen, shows up regularly in the paintings of the Canada 7. One aspen painting I especially like, by Franklin Charmichael, shows the tree hanging over a canyon. "October Gold", at the McMichael. None of the reproductions online or in books do the painting any kind of justice. Other that that, the white trunks of the bigtooth are usually used as a graphic element.