Anderson FL, Knees SG. STUDIES IN THE FLORA OF ARABIA: XXXII. VACHELLIA PENNIVENIA (LEGUMINOSAE: MIMOSOIDEAE) – A LITTLE-KNOWN TREE SPECIES ENDEMIC TO THE ISLAND OF SOCOTRA. Edinburgh J. Bot. 2019;76(3):313-318. doi:10.1017/S0960428619000076