Pogostemon benghalensis
Pogostemon benghalensis, commonly known as the Bengal shrub mint, is a species of flowering plant belonging to the family Lamiaceae.
Description
It is a herb with a strong, solid, and angular stem. The leaves are opposite, with petioles up to 2.5 cm long; the lamina is ovate, about 13 × 6 cm in size, with a cuneate base, double-dentate margin, and acuminate apex. The inflorescence is a verticillaster arranged in a terminal false spike, about 7 cm long, often branched at the base into two or more lateral spikes. The calyx is inflated, tubular, about 4 mm long, hairy on the outside and glabrous within, with five ciliate teeth approximately 1 mm long. The corolla is tubular, up to 8.7 mm long, two-lipped, with the upper lip three-lobed. There are four stamens inserted at different heights in the corolla tube, with filaments 5–7 mm long.The fruit consists of four nutlets that are obovoid, about 1.2 mm long, and finely punctate. The species closely resembles Pogostemon plectranthoides Desf., but can be distinguished by its narrower corolla tube and less crowded inflorescence.