Characterization of palm date varieties (Phoenix dactylifera L.) growing in Saudi Arabia: Phenotypic diversity estimated by fruit and seed traits oleh Abdullah H.M. ALRASHIDI, Arshad JAMAL, Mohammad J. ALAM, Lassaad GZARA, Najla HADDAJI, Mnaouer KACHOUT, Abdelmuhsin ABDELGADIR, Riadh BADRAOUI, Salem ELKAHOUI