Developmental anatomy of floral nectaries in three species of monocotylendonous plants Quantitative Determination of Mangiferin in Rhizoma Belamcandae and Its Substitute of Iris L. Bacteriostasis of Volatile Compounds from Six Perennial Root Flower Plants Floral Syndrome and Breeding System of Iris tectorum Preparative method of tectoridin from rhizome of Iris tectorum Analysis and determination of irone in Iris tectorum Mass Isolation and Culture of Pollen Protoplasts from Three Plant Species