In the context of systematic and biosystematic studies on Eurasiatic Crataegus (Rosaceae, subtribe Pyrinae) based on leaf and petal SEM photographs and morphological features, Crataegus khatamsazae Hamzeh'ee, K. I. Chr. & Attar sp. nov. and C. hatamii Hamzeh'ee, K. I. Chr. & Attar sp. nov. are described as new taxa, and C. caucasica is reported as a new record to Iran. Crataegus aminii is found to be synonymous with C. babakhanloui and not with C. ambigua subsp. ambigua. The description of C. kurdistanica is improved. The situation for C. sakranensis in Iran is discussed and its morphological characterization is improved. A new identification key to the recognised Iranian taxa of subser. Erianthae is provided and the distributions of these taxa are outlined.