This study aimed at suggesting and concluding the degrees of relationship between some morphological features of date palm trees cultivars from the Sub-Saharan region and some bio-ecological factors of this area. Four date palm varieties (Wad-Laggi, Wad-khateeb, Gondaila, and Barakawi) from Omdurman City were studied as representative samples of the most famous date palm types. Besides observing the morphological features of date palm trees, some bio-ecological data of this area were observed and reported from international literature and some interviews with expert peoples. Our results had been expressed as “degree of relationship” between the two study variants, estimated by comparing and weighting the differences in the morphology of date palm trees grow under bio-ecological conditions of the study area and other regions. We suggested that some morphological features of date palm trees such as the number of leaflets, the color of leaves, number of spines, and fruiting period (days), had strong relations with the bio-ecological system, ((expressed as (+++)), while some other feature such as the length of stem (tree height), length of leaves, fruit length and fruit width had some relations. Some morphological features i.e. stem diameter, spine length, and fruit weight seem to have no relations with the bio-ecological factors.