Rhamnus petiolaris
From LSJ
ξένος ὢν ἀκολούθει τοῖς ἐπιχωρίοις νόμοις → as a foreigner, follow the laws of that country | when in Rome, do as the Romans do
Rhamnus petiolaris is a species of flowering plant in the family Rhamnaceae. It is native to Iraq, Lebanon, Syria, and Turkey.