The peroxidase isozyme of functional leaves of Allium ascalonicum L. , A. cepa L. and A. fis-tulosum L. was analysed. The relationships among three species and the relationships among the varieties of A. fistulosum L. were distinguished. The relationship between A. ascalonicum L. and A. cepa L. was nearer than that between A. ascalonicum L. and A. fistulosum L.