Crataegus spp. are used for horticultural and medicinal purposes. The medicinal importance of Crataegus is attributed to components such as flavonoids, procyanidin, aromatic acid, and cardiotonic amines. The genetic relationships among the five Iranian Crataegus species including C. aronia, C. pontica, C. meiery, C. monogyna, and C. pentagyna were assessed using inter simple sequence repeats (IS...