Abstract:The systematical evolution of genus Meconopsis, first of all, depends upon the alternation of environmental conditions from a low altitude to a higher altitude, from tlie habitats under the forests to meadows and even to alpine desetrs. Corresponding to these systematical alternatione they change mor-phologically from branched stems to ullbranched stems and fiually, to no stem at all, from panicles to brateate raceme to bractless raceme and finally. to simple flowered basal scapes. This amply reveals the dialectic unity between plants and environments in the long-term historical development.