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Abstract

Verbena tenuisecta Briq. (Purple Moss Verbena; Verbenaceae) is an ornamental and traditional medicinal herb naturalized in the temperate regions of northern Pakistan. Despite its ethnobotanical uses in managing fevers, gastrointestinal disorders, and inflammatory conditions, comprehensive pharmacognostic standardization and bioactivity profiling of this regional flora remain undocumented. This study presents a systematic morpho-anatomical characterization, quantitative phytochemical screening, and multi-target in vitro biological evaluation of crude methanolic, ethanolic, and ethyl acetate leaf extracts of V. tenuisecta. Pharmacognostic evaluation established key macroscopic and microscopic anatomical diagnostics, including anomocytic/parasitic stomata, uniseriate non-glandular trichomes, spiral tracheids, and distinct vascular bundles. Phytochemical profiling revealed rich pools of total phenolics and flavonoids alongside saponins, tannins, mucilage, and terpenoids. In antibacterial assays using the agar well diffusion technique against Escherichia coli (ATCC 25922), Bacillus subtilis (ATCC 6633), and Staphylococcus aureus (ATCC 25923), the crude methanolic extract demonstrated superior growth inhibition against E. coli (19.33 ± 2.08 mm zone of inhibition at 150 μg/mL; p < 0.05). Antifungal screening against Aspergillus niger (ATCC 16404), Aspergillus fumigatus (ATCC 1022), and Penicillium spp. demonstrated marked susceptibility to ethanolic and ethyl acetate fractions (15.67 mm to 17.00 mm zones). Brine shrimp (Artemia salina) lethality assays confirmed potent dose-dependent cytotoxicity, with the methanolic extract exhibiting an LC50 of < 50 μg/mL (80% mortality at 500 μg/mL). Furthermore, phytotoxic screening on Lemna minor showed up to 75% frond inhibition at 500 μg/mL (p < 0.05). Free-radical scavenging capability evaluated via the DPPH assay revealed significant antioxidant activity (IC50 = 1.02 mg/mL for the methanolic fraction), directly correlating with high polyphenolic content. These findings provide essential pharmacognostic standardization benchmarks and establish V. tenuisecta as a viable, natural multi-target candidate for future phytopharmaceutical and agrochemical development.

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