The three-leaflet pattern of the boxelder tree’s leaves, the V-shaped samaras, and a map of the US showing how the tree grows from the eastern US to west of the Mississippi river.

Figure 13. Boxelder

The three-leaflet pattern of the boxelder tree’s leaves, the V-shaped samaras, and a map of the US showing how the tree grows from the eastern US to west of the Mississippi river.