The study was conducted to identify 15 valuable medicinal plants from Khyber Pakhtunkhwa, Pakistan. In the present study, seasonal phenological behavior in leaf droplets, flower and fruit activity was discussed. The morpho-palynological characters studied were size, shape, polar and equatorial diameters LM and SEM were used for the importance of their classification. The present investigations examined the pollen apertures were tricolporate, tricolpate, tetracolporate, hexacolportae and polycolportae. Pollen shape classes according to P/E ratio were identified as oblate spheroidal, spheroidal and prolate. We found the following 11 types of exine sculpture pattern occurred in the investigated species. Similarly, variation in pollen length was prominent and the largest pollen on polar and equatorial view was recorded for Trianthema portulacastrum while the smallest one was observed for Cleome brachycarpa respectively. Exine thickness of maximum value was examined in Trianthema portulacastrum while minimum in Heliotropium europaeum. Pollen fertility was estimated highest in Indigofera linifolia while highest percentages of sterility were observed in Croton bonplandianus. The findings analysis of pollen morphological data demonstrated that pollen characters of studied medicinal plants shows species level variations and of taxonomic importance and shown phenological pattern of species to understand their response to climatic factors.

Key words: Medicinal plants, Taxonomy, Pollen morphology, Phenology, LM, SEM