Morphological and phytochemical features of secretory structures in Hypericum richeri (Clusiaceae)

Structural and complementary chemical studies were carried out on Hypericum richeri, a lesser known species amongst those reported for folk medical use. We found only one type of secretory glands consisting of black dots which are present even in early emerging leaves. In the fully expanded leaves the nodular structure appears to be composed by a cluster of cells. These become unfunctional and disassembled towards the end of their development, and are used only as reservoirs of secretion products. HPTLC analyses showed that flower buds and flowers are the plant parts richest in active compounds. However, the spectrum of active compounds accumulated by H. richeri was both quantitatively and qualitatively similar to those reported for the pharmaceutically utilized. H. perforatum, and thus could potentially represent a possible alternative to this species.