Tetraploid （2n=4x= 96） and hexaploid （2n= 6x= 144） plants were successfully induced from seedling of Lagerstroernia indica L. by processing shoot apical meristem with colchicine. The results indicated that the variants, which were characterized by stunted but stout plant, wrinkled and thicker leaves, less stoma frequency, larger（length rised by 65.79 % and width, 45.01%） guard cells （a pair, the same as below）, more larger（rised by 80.25%） chloroplasts in each pair of guard cells, were significantly different from the diploid plants in morphology. Tetraploid plant got markedly larger （rised by 59. 07%） pollen grains, slightly larger petals, longer inflorescence but less flowers than diploid plants. Endopolyploidy was observed in both induced tetraploid plant and diploid plant, and endopolyploidy degree of the former was lower than that of the latter.
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