Inventory of the vascular flora of the Byblos’ islet (El Zireh), Jbeïl, Lebanon. — The biodiversity of small islands and islets of the Mediterranean coast was long neglected, but sometimes presents surprises. The vascular flora of the Byblos’ islet (0,2 ha), called “El Zireh”, was inventoried on June 1st, 2013. The inventory, presumed exhaustive, registered the presence of 19 taxa. Three are endemic of the Near East, including a misunderstood taxa considered here for the first time under a new name (Rostraria cristata var. vestita, here lectotypified). Another is endemic of Lebanon (Matthiola crassifolia) and included in the 1997 IUCN Red List. No exotic species were found. Threats seem to be low and essentially linked with human pleasure activities (fishing, diving).