The present study was aimed to assess the vascular plant diversity in term of floristic composition, habit, life form and leaf size classification at Galiyat valley of district Abbottabad, KP. The vascular plant species investigated during the research were 343 distributed in 250 genera and 87 families. Pteridophytes were 7 species (2.04%), Gymnosperms 6 species (1.74%), Angiosperms (monocots) with 54 species (15.74%) and Angiosperms (dicots) with 276 species (80.46%). The habit of different plant species showed that herbs were 228 species (66.47%), Shrubs 63 species (18.36%), trees 41 species (11.95%) and climbers were 11 species (3.20%). The leading family with highest number of species and genera was Asteraceae with 32 species and 25 genera followed by Poaceae with 31 species and 19 genera. The other dominating families include, Lamiaceae (28 spp. & 17 genera), Rosaceae (22 spp. 11 genera), Ranunculaceae (16 spp. & 10 genera), Fabaceae (11 spp.  & 8 genera), Apiaceae (10 spp.  & 9 genera), Polygonaceae (10 spp. & 8 genera), Caprifoliaceae (10 spp.  & 6 genera). Remaining families were represented by less than 10 plant species. Life form classes showed that Therophytes were dominating with 119 species (34.69%), followed by Hemicryptophytes with 61 species (17.78%). The other life form classes were Geophytes 38 species (11.07%), Megaphanerophytes 46 species (13.41%), Nanophanerophytes 42 species (12.24%), Chamaephytes 29 species (8.45%) and Lianas 8 species (2.33%). The study of leaf size classification showed that Microphylls were dominating with 134 species (39.06%) followed by Nanophylls with 98 species (28.57%). Leptophylls were 33 species (9.62%), Mesophylls 72 species (20.99%) and Megaphylls were 06 species (1.74%).  

Index terms - Biological spectrum, floristic composition, Galiyat, habit, life forms, leaf size, vascular plant diversity