[1] Allenius is known for introducing two fruits to Italy: jujube (zizipha) which he brought from Syria; and a variety of crabapple (tuber) which he found in Africa.
According to Pliny the Elder, Allenius had grown them in his camp from slips; and he adds about the crabapple that "the fruit is more like a berry than an apple, but the trees make a particularly good decoration for terraces.
[3] Ségolène Demougin would go further, and agrees with D. McAlindon that Allenius was originally of the equestrian order, and admitted to the Senate upon becoming a quaestor between the years AD 15 and 20.
Syme offers some explication of these offices: the first time as legatus under Tiberius, Allenius was commander of a legion, although its identity is unknown; the date he was praetor is AD 27; the time as propraetorian legate was a governorship in one of the five praetorian provinces under imperial control.
[3] Syme also implies that Allenius owed his consulship to the influence of Lucius Vitellius.