I've heard of this large shrub, but have only seen a small colony at Jenkins Arboretum in southeast Pennsylvania. It is not an Ash, but a member of the Citrus Family (Rutaceae). Its native range is all around the Great Lakes and up the St Lawrence River somewhat, down the Appalachians to northern Georgia over west to the Ozarks and Iowa. Its pinnately compound leaves get to 9 inches long with 5 to 11 leaflets. Leaflets 1 to 3 inches long being either toothless or minutely dull toothed. Foliage is dotted with translucent oil glands and is aromatic when crushed, as is all parts of the plant, smelling like lemon peel. Tiny greenish-yellow flowers in April-May before leaves emerge. Fruit is a reddish to brown capsule 2-valved with black seeds. The twigs have paired spines at the base of the leaves. This upright, much-branched shrub spreads by underground stems to become a dense thicket. I have never seen it used in conventional horticulture. Some native plant nurseries as Possibility Place in Illinois, Izel Plants in Maryland, Out Back Nursery in Minnesota, and Arche Wild Native Plants in eastern Pennsylvania sell some. (Sometimes this species is called Toothache Tree because Native Americans chewed on twigs and fruits to alleviate tooth ache pain, as the plant's chemicals numbed pain. The similar species found farther south called Hercules-Club is also called Toothache Tree, so there can be confusion.)

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