A new variety of Magnolia(Magnoliaceae) from Hubei,China Phylogenetic Relationship Between Magnolia wufengensis and Several Related Species in Subgenus Yulania Based on AFLP Marker Analysis Optimal Light Regime for the Rare Species Magnolia wufengensis in Northern China A new species of Magnolia(Magnoliaceae) from Hubei, China Taxonomy Significance Based on Pollen Morphology Observation of Five Species of Magnolia L. Including Magnolia wufengensis L. Y. Ma et L. R. Wang