Morphoanatomical and Elemental Analysis of Clerodendrum chinense (Osbeck) Mabberley

Background: Clerodendrum chinense (Osbeck) Mabberley (Lamiaceae) is an underexplored medicinal plant traditionally used in various indigenous systems of medicine. Despite its therapeutic relevance, detailed pharmacognostic and microscopic data required for proper authentication and quality control of the raw drug remain limited. Aim: The present study aimed to establish comprehensive pharmacognostic standards for C. chinense through detailed anatomical, microscopic, histochemical, and surface micromorphological investigations, along with ethnobotanical documentation. Methods: Fresh plant materials were subjected to macroscopic and organoleptic evaluation. Anatomical studies were carried out using Light Microscopy (LM) on transverse sections of the leaf, midrib, and petiole. Powder microscopy and histochemical tests were performed to localise cellular constituents. Surface micromorphology and elemental composition were analysed using Scanning Electron Microscopy (SEM) coupled with Energy-Dispersive Spectroscopy (EDS). Results: Anatomical examination revealed typical dicotyledonous features. Leaves were amphistomatic, showing both diacytic and anisocytic stomata. The midrib exhibited several simple multicellular covering trichomes with a few glandular trichomes, while the lamina showed a dorsiventral structure with sparse trichomes. The petiole contained numerous multicellular covering trichomes. Powder microscopy showed diagnostic elements such as trichomes, stomata, mesophyll fragments, fibres, vessels with spiral and annular thickenings, and prismatic crystals. Histochemical analysis confirmed the presence of cutin in the epidermis, tannins in the hypodermis, and lignin in the xylem. Conclusion: The study establishes reliable diagnostic parameters for the identification and standardisation of C. chinense. Major Findings: These findings support the development of a herbal monograph and enable accurate authentication of the raw drug, thereby strengthening regulatory quality control.