Abstract
Tetraploid in Lilium formosanum were obtained by colchicine treatment. Reciprocal crosses of diploids and tetraploids were made but only diploids were obtained from 2x×4x. Hypo-, hyper- and eu-tetraploids were obtained from 4x×4x and 4x×2x. Even some of the individuals having 48 chromosomes were not found to be eu-tetraploids because of the lack or excess of certain chromosomes. However, these hypo-, hyper- and eu-tetraploids could be of great use from the ornamental point of view because of their large, heavy-textured crowns and short stems.
