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Comparative anatomy of secretory structures of leaves in Hypericum L. Studies on the Secretory Structures in Seniawin St John‘swort (Hypericum seniawinii) Studies on the Secretory Structure of Hypericum erectum Megasporogenesis, Development of Megagametophyte and Embryo in Flaveria bidentis (L.) Kuntze Studieson the relation between secretory structures and itssecontary product in Hypericum sampsonii Secretory Structures and Their Relationship to Accumulation of Camptothecin in Camptotheca acuminata (Nyssaceae) Morphological identification of 20 medicinal species in Hypericum The Secretory Structure of Hypericum perforatum and Its Relation to Hypericin Accumulation