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The pharmacognostical evaluation of Solanum nigrum Linn., commonly known as black nightshade, was undertaken to establish its botanical identity and quality parameters. The study focused on the macroscopic and microscopic examination of the plant's leaf, stem, and root parts. Macroscopic analysis revealed that the leaves were simple, alternate, and ovate with entire margins. The stems were herbaceous, cylindrical, and branching, while the roots were thin, tap root, and branching. Microscopic examination revealed unique anatomical features for each part. The leaf showed dorsiventral mesophyll with hypo-amphistomatous and anisocytic stomata and glandular trichomes. The stem exhibited an epidermis with unicellular trichomes, collenchyma, and scattered vascular bundles. The root displayed a typical dicot root structure with cork cells, endodermis, pericycle, and xylem vessels. These findings contribute to the pharmacognostical standardisation of Solanum nigrum Linn., aiding in its authentication, quality control, and formulation of herbal medicines. The detailed macroscopic and microscopic characteristics described in this study can serve as reference standards for the identification and quality assessment of Solanum nigrum Linn. in herbal drug preparations.
Priya et al. (Sun,) studied this question.