Vitis (Latin: vitis - grapevine) is a status staff of a centurion made from grapevine. It served as a symbol of a centurion's authority and was used for corporal punishment of legionnaires.
Tacitus mentions a centurion nicknamed "Cedo Alteram" ("Bring Another"), which he earned because he frequently broke vitises over the backs of offending legionaries. He was eventually killed by legionaries during a military mutiny.
The vitis is a mandatory attribute of a centurion in all surviving depictions. Even if the centurion lacked other regalia in reliefs (phalerae, helmet with a crest), he invariably held a vitis. Often, it is precisely by the presence of a vitis that the rank of depicted soldiers can be identified.