Dear Pongsak It looks like you may have a hybrid. One of the parents appears to be one of the white flowered species – N. candida, N. gracilis, or N. northiana. These three species can be distinguished by the appearance of the plant, but not by the appearance of the flower, because all three have nearly identical flowers. Of the three, N. candida is the one with perfume, so I think that is one parent. However, none of these has spotted tepals; the one Neomarica whtih speckled tepals is N. guttata, which has spots similar to those on your plant, but more of them, and they are typically violet. So, my guess is that you have a lovely plant of N. candida x N. guttata. David Ehrlich