Which species belongs to the Ash family?

Fraxinus sp., which encompasses various species of ash trees, is the correct answer as it directly pertains to the Ash family, scientifically known as Oleaceae. This family includes not only the Fraxinus genus but also other woody plants, allowing for a classification that specifically connects these trees to their family characteristics, such as compound leaves and the presence of opposite leaf arrangements.

Other options listed do not belong to the Ash family. Thornless Honeylocust is classified under the Gleditsia genus, while Ilex x attenuata 'Fosteri' is a hybrid of the Ilex genus, commonly known as hollies. Diospyros virginiana, better known as the American Persimmon, belongs to the Ebenaceae family. Therefore, only Fraxinus sp. accurately represents a member of the Ash family among the given choices.