Rhynchotechum ellipticum (Wall. ex D. Dietr.) A.DC. as an underexplored medicinal plant of Northeast India: Current evidence and future directions

Rhynchotechum ellipticum (Wall. ex D. Dietr.) A.DC. (Gesneriaceae) is an underexplored medicinal plant traditionally used by indigenous communities in Northeast India, particularly for diabetes and related disorders. The present work aims to critically synthesise the available ethnomedicinal, phytochemical, pharmacological, and microbiological evidence on R. ellipticum and identify key research gaps for future therapeutic development. A comprehensive literature survey of peer-reviewed publications (≈approximately 25 studies) was conducted using major scientific databases, encompassing ethnobotany, phytochemistry, pharmacological assays, nutraceutical evaluation, and endophytic microbiology. Available data indicate that leaf and stem extracts contain phenolics, flavonoids, sterols, triterpenoids, alkaloids, and carbohydrates, with reported total phenolic content of up to ∼617 mg GAE/100 g and flavonoid content of ∼266 mg/100 g. Pharmacological studies have demonstrated antioxidant, cytotoxic (LC₅₀ ≈ 55–72 μg/mL), thrombolytic (∼34–42% clot lysis), moderate antibacterial, and nutraceutical activities. Notably, endophytic actinobacteria associated with R. ellipticum produce multiple bioactive metabolites, including antibiotics and the anticancer compound paclitaxel, as supported by the presence of PKS and NRPS biosynthetic gene clusters. Despite these promising findings, systematic toxicity studies, pharmacokinetic evaluations, and clinical evidence are lacking. This review represents the first comprehensive synthesis of the current knowledge on R. ellipticum, highlighting its pharmacological potential while underscoring critical gaps in safety, standardisation, and clinical validation. These findings support R. ellipticum as a culturally significant and scientifically promising candidate for future drug discovery, nutraceutical development, and conservation-oriented research in Northeast India.