Hypericum dogonbadanicum Assadi sp. nov. is described from S. Iran as a new species to the science. Its most close affinity is suggested to be H. balearicum L. from the Sec. Psorophytum (Spach) Nyman, but due to presence of persistent petals and stamens, necessity of a new section for the new species is considered. Allium szovitsii, Arabis christiana, Briza humilis, Caragana grandiflora, Chrozophora oblongifolia, Erodium armenum, Gypsophila graminifolia, Helianthemum kahiricum, Minuartia umbellulifera. Paeonia cf. mlokosewitschi, Silene cyri and Zygophyllum miniatum are recorded as new to Iran. Larger distribution area is recognized for Primula gaubaeana.