Ziziphus rivularis Codd. from Faifa, SW Saudi Arabia: a new addition to the flora of Arabian Peninsula

In addition to the continuous discoveries of new wild plant species and the increasing additions to the flora of Saudi Arabia, this study recorded Ziziphus rivularis for the first time in Saudi Arabia and Arabian Peninsula. Through the field work, the species was discovered with limited distributed in Faifa escarpments, Southwestern Saudi Arabia, and was not reported or collected previously from Arabian Peninsula. The accurate identification is performed and confirmed using the published literature and formal taxonomic websites. Location map, plant photographs, taxonomic notes and full morphological description are included. Simple comparison with those of Ziziphus taxa grow naturally in the same area is discussed for distinguish of the new species. The global diversity of the species verified that the plant can grow in Southwestern Saudi Arabia, where the environmental conditions which the plant prefers are provided, so the plant considered native to the flora of Saudi Arabia. Intensive field work is recommended for discovering its distribution.