Studies on Essential Oil Composition in Leaves of Torreya grandis cv. ‘Merrillii‘ and Chemotaxonomy Diterpenoids from aril of Torreya grandis cv. merrilli Advances in studies on active constituents and their pharmacological activities for plants of Torreya Arn. Morphological Differentiation of Female Flower Bud of Torreya grandis cv. ‘Merrillii’