'Fraxinus spp.' refers to which common tree?

The term 'Fraxinus spp.' specifically refers to the genus of trees commonly known as ash. This genus includes various species, such as the white ash (Fraxinus americana) and green ash (Fraxinus pennsylvanica), among others. Ash trees are characterized by their compound leaves, opposite leaf arrangement, and distinctive blackish-brown buds. They are also known for their medium to large size and are commonly used for timber, landscaping, and shade.

In contrast, the other tree choices do not belong to the Fraxinus genus. Oaks belong to the Quercus genus, maples are part of the Acer genus, and walnuts belong to the Juglans genus. Each of these genera has unique characteristics that differ significantly from those of ash trees, contributing to the clear identification of 'Fraxinus spp.' specifically as ash.