A dwarf mutant plant having small leaves and light-orange flower was identified in the M2 generation from gammaray treated groundnut cultivar VRI 2. The mutant bred true in successive generations. An investigation was made toknow the genetics of light-orange flower in groundnut mutant. The Spanish bunch cultivar VRI 2 having orangeflower was crossed with the light-orange flower mutant. The F1 plants exhibited orange flower indicating that theorange colour is governed by dominant gene. However, the F2 population segregated as 3 orange: 1 light-orangeflower indicating the light-orange flower trait is governed by a single recessive gene.