Alkaloids, flavonoids, triterpenes, sterols and saponins were qualitatively screened in different organs of five monocotyledonous species belonging to different genera: Allium cepaL., Asparagus densiflorus (Kunth) Jessop, Pancratium tortuosum Herbert., Kniphofia nubigena Mildr., and Urginea maritima (L.) Baker. Phenolic compounds were separated  using thin layer chromatography to ascertain their relative phylogenetic position. Data collected from the qualitative phytochemical analysis, paired affinity, group affinity and isolation value reflected taxonomically significant information supported the inclusion of these species in different families by many taxonomists in the most recent  classification systems.