Oregon-grape (Mahonia aquifolium, Berberiaceae) is an evergreen shrub related to the barberry. Some authors submerge Mahonia in the barberry genus, Berberis. The plant is in no way related to grapes, but gets the name from the purple clusters of berries. It is sometimes called Tall Oregon-grape to distinguish it from Creeping Oregon-grape (M. repens) and "Cascade" or Dwarf Oregon-grape (M. nervosa). The name is often left un-hyphenated as Oregon grape, though doing so invites confusion with the true grapes. It also occasionally appears in print as Oregongrape.