|X. americanum is a large shrub or small tree, 15-25 feet tall. It has many 1/2 inch long prickles and is seldom cultivated in gardens. The foliage is dark green, with very attractive compund pinnate leaves, and has no pests. Yellowish-green flowers appear before the leaves on last year's wood. Separate male and female trees. It is a good barrier plant, particularly in areas of poor soil. The name "Toothache-tree" is derived from the apparent use by Native people for relief of toothache. Prickly ash bark is still used in the herb trade today. Native from Quebec to Nebraska and Virginia.