Morphology of Huperzia serrata and Its Stomata Characteristics under Different Light Treatments Response of leaf of Nitraria tangutorum Bobr stomata characteristics to artificial simulation of rainfall POLYPLOID INDUCTION OF Populus HYBRID THROUGH ZYGOTIC CHROMOSOME DOUBLING WITH HIGH-TEMPERATURE TREATMENT Comparison and analysis of the characteristics of mutant SP2008-3 and adalayd in seashore Paspalum