The Phoenician Juniper Juniperus phoenicea is a lower-altitude cousin of the Grecian juniper. At present it is found scattered throughout the mountains of northern Sinai and southern Jordan, and Hepper notes that it occurs throughout the higher parts of Sinai and Arabia. In ancient times it may have been found throughout the Negev. Deuteronomy 2:36 refers to a town on the edge of the Wadi Arnon called Aroer, which is probably cognate with the Hebrew word ‘ar‘ar, indicating that these trees may have grown there. The identification of ‘ar‘ar/‘aro‘er as the Phoenician juniper is supported by the fact that Arabs in several countries call this juniper ‘ar‘ar. Since it is closely related to the cedars, some people also call it the “Phoenician cedar.” Note that Hebrew uses the same word ’erez to cover both the Phoenician juniper and the mighty cedar of Lebanon.

The Phoenician juniper is a short shrub or tree that may reach 5 meters (17 feet). It has tiny leathery leaflets and small berry-like cones.

We advocate translating ’erez as “juniper” in Leviticus and Numbers, if that species is known, or using a transliteration from a major language. The reference to ‘ar‘ar in Jeremiah 17:6 is poetic, and a cultural equivalent may be used; in a more literal version a transliteration may be used. Some scholars take the Hebrew word ‘aro‘er in the last line of Jeremiah 48:6 as meaning “juniper.”

Source: Each According to its Kind: Plants and Trees in the Bible (UBS Helps for Translators)