The current sunflower hybrid production is realized only on the base of cytoplasmic male sterility (CMS) of "petiolaris" type. This cytoplasmic uniformity is a potential risk for the yield of sunflower and is a reason for a series of studies aimed at discovering new CMS sources. Large diversity of wild species and cultivated varieties is a premise for successful breeding of hybrids with high yielding potenrial. In 1984 and 1987, new sources of CMS, marked CMS-ARC_1 and ARG-3, were produced by interspecific hybridization of the wild annual species H. argophyllus, used as the female parent, and the cultivated sunflower, used as the male parent. The new cytoplasmic sterility is maintained by a large number of varieties and self-pollinated lines. Some lines known as restorers for CMS "petiolaris" type appear also to be restorers for the new CMS sources. This shows that these sources can be used for development of sunflower hybrids. The hybrids developed on the base of the two new cMS sources substentiate the above statement. The conventional CMS and the new CMS sources, ARG-1 and ARG-3, are similar in some points and different in others. Some lines known as maintainers for CMS "petiolaris" type possess the ability to restore, to a certàin degree, the fertility of plants produced on the base of the new CMS. A study undertaken to clarify the differences is in progress