OBSERVATION AND STUDY ON THE MORPHOLOGY VARIATION OF MAGNOLIA BIONDII PAMP. Lignans in flower buds of Magnolia biondii Genetic Diversity of Magnolia biondii(Magnoliaceae) Assessed by ISSR Polymorphisms Biologically Active Lignins from Magnolia biondii Pamp. Analysis of volatile constituents in two species of genus Magnoloia by HS-SPME-GC-MS