Zanthoxylum americanum Also, Known As: Angelica Tree Prickly Ash Suterberry Toothache Tree The prickly ash or the Zanthoxylum americanum is a tall shrub that may also be described as a small tree and usually grows up to a height of twenty feet. The shrub is distinguished by its barbed stalks and branches. The leaves of … Continue reading Plant Profile: Prickly Ash