Christ's thorn jujube

Sidr is mentioned in two places in the Qur'an, and the sidr mentioned there is usually identified with this species; it is therefore highly valued by Muslims in the Middle East.

The fruit of sidr is called nabaq; medieval Arabic medical works name the tree sidr and its fruit nabaq.

Sidr (Ziziphus spina-christi) is an evergreen tree of the buckthorn family Rhamnaceae, of tropical Sudanese origin.