Free filaments of anthers (polyadelphous stamens) and other associated traits such as elongated keel petals wrapped over the wings and the standard considerably delay opening of floral buds, ensuring total self-fertilization in a pigeonpea genotype, ICPL 87154. Inheritance of free filaments and other associated traits of ICPL 87154 were studied in the F1, F2, BC1F1 and BC2F1 generations of its two crosses with high-yielding long-duration pigeonpea varieties, IPA 203 and Bahar. The results suggested that free filaments of anthers in the genotype ICPL 87154 are controlled by double recessive “cleisto” genes, pct1pct1 pct2pct2. Backcross derived advance breeding lines with such selfing attributes showed zero per cent natural outcrossing, thus spontaneously sustaining their genetic purity. Two such lines (RCEA 14-1 and RCEA 14-5) with yield potential comparable to the high yielding parent (IPA 203) were selected for further use.