1 23 Acta Physiologiae Plantarum ISSN 0137-5881 Volume 34 Number 4 Acta Physiol Plant (2012) 34:1313-1320 DOI 10.1007/s11738-012-0928-8 Secondary metabolites of Hypericum orientale L. growing in Turkey: variation among populations and plant parts Cuneyt Cirak, Jolita Radusiene, Zydrunas Stanius, Necdet Camas, Omer Caliskan & Mehmet Serhat Odabas