Abstract: Two populations ( located at Sanhu town , Xingan co., Jiangxi province ) of Scilla scilloides polyploid complex were surveyed cytologically , and four cytotypes, BB, BBB, BBBB, and ABBB were observed among two hundred and sixty three individuals . BBBB and ABBB were new records in East Asian continent . Until now, nine of the 12 euploid cytotypes of this polyploid complex have been found in the East Asian continent , which suggests the continent is one of the important locations where the cytotypic differentiation of the complex takes place . The occurrence of ABBB and BBB, but not ABB and aneuploids maybe demonstrates the distribution range of BB have contracted on the continent and Korean peninsula, AABB populations of plants with subglobose bulb have degenerated on the continent since Tertiary , and the mixed populations of BB and AABB are the relicts of populations on the continent , Korean peninsula and Cheju island . The cytotype component similarity in these populations to that in populations on the Japanese archipelago may show some historical relations between them, but this fact is not able to manifest the hypothesis that this species on the Japanese islands is one of“prehistoric naturalized”plants introduced from China .

Key words: Scilla scilloides