Synopsis The angiosperms have been classified into dicotyledons and monocotyledons based on the number of cotyledons, leaf venation, arrangement of vascular bundles etc. The monocotyledons have one cotyledon, leaves usually with parallel venation, vascular bundles scattered and the floral parts usually in threes. In India monocotyledons are represented by 674 genera and 4081 species under 42 families (Karthikeyan et al. 1989). In Uttar Pradesh the number of genera and species approximately is 365 and 1265 respectively under 35 families.