Meconopsis seedlings have distinctive leaves. All species in this genus have a similar pair of long narrow cotyledons (seed leaves). In some species they are slightly larger than others but all are easily recognized and once you have grown a few seed pans full, they are easily told from seedlings of other genera. After about a week they show a tiny little typical leaf in between the cotyledons and these are always covered in hairs like all adult leaves throughout the genus.