Rooted cuttings of small decorative type Chrysanthemum cv Kalyani Mauve were irradiated with 150, 200 and 250 Gy of gamma rays. Reduction in survival, plant height, branch, leaf and flower head number and leaf size and increased chromosomal aberration, foliage and floral abnormalities along with delayed flowering behaviour were observed after irradiation. Somatic mutation in flower colour and shape were detected as chimera in all the dose. Four flower colour and one changed flower shape mutants have been isolated and established in pure form. Comparative cytomorphological and anatomical analysis of 5 mutants showed significant differences in some characters over those of their original cultivar in addition to flower colour/shape.