title: [Morphological identification of 20 medicinal species in Hypericum].
abstract: OBJECTIVE
  To provide anatomical evidences for the morphological and histological identification of 20 medicinal species in Hypericum.
  
  
  METHODS
  Morphological and anatomical study on the organs of 20 medicinal species in Hypericum using tissue clearing, paraffin sectioning and thin sectioning.
  
  
  RESULTS
  According to their anatomical characteristics, the secretory structures can be divided into nodules, secretory cavities (canals) and tiny secretory tubes of 20 medicinal species in Hypericum. Hypericin was produced and stored in the nodules, while the volatile oil was produced and stored in the secretory cavities (canals) and tiny secretory tubes. The types differed markedly from each other in location, diameter and distributional density of leaf, and the anatomical structures differed from each other of stem, calyx, petal, anther and fruit among the 20 species in Hypericum.
  
  
  CONCLUSIONS
  The secretory structures may be as anatomical evidences for the morphological and histological identification of 20 medicinal species in Hypericum.
authors.affiliation: Lishui Vocational and Technical College, Lishui 323000, China.
authors.forename: Da-Li
authors.initials: DL
authors.lastname: Sun
authors.forename: Chun-Hong
authors.initials: CH
authors.lastname: Zhou
authors.forename: Min-Min
authors.initials: MM
authors.lastname: Shao
authors.forename: Hong-Fei
authors.initials: HF
authors.lastname: Lv
authors.forename: Zheng-Hai
authors.initials: ZH
authors.lastname: Hu
mesh_terms: D000873:Anthracenes; D035264:Flowers / Q000033:anatomy & histology / Q000737:chemistry; D005638:Fruit / Q000033:anatomy & histology / Q000737:chemistry; D020902:Hypericum / Q000033:anatomy & histology* / Q000737:chemistry / Q000145:classification; D009822:Oils, Volatile / Q000032:analysis; D010569:Perylene / Q000031:analogs & derivatives / Q000032:analysis; D018515:Plant Leaves / Q000033:anatomy & histology / Q000737:chemistry; D018547:Plant Stems / Q000033:anatomy & histology / Q000737:chemistry; D010946:Plants, Medicinal / Q000033:anatomy & histology* / Q000737:chemistry / Q000145:classification; D013045:Species Specificity
chemical_list: D000873:Anthracenes; D009822:Oils, Volatile; D010569:Perylene; C004965:hypericin