Stenogyne angustifolia var. angustifolia is a short-lived, low-growing perennial vine in the mint family (Lamiaceae). Their stems are weakly four-angled and are glabrous except for occasionally pubescent at the nodes. Leaves are membranous, narrowly ovate or elliptic to lanceolate or oblanceolate, 2.6 to 5.3 cm long (1.0 to 2.0 in), 0.6 to 1.5 cm (0.23 to 0.6 in) wide, glabrous, with margins serrulate. The apex is acute or rarely obtuse with acute base, and petioles 4 to 16 mm (0.15 to 0.62 in) long and glabrous. Flowers are two per verticillaster, with pedicels 2 to 8 mm (0.08 to 0.31 in) long, and puberulent. The calyx is bilabiate, narrowly campanulate, glabrous, and 8 to 18 mm (0.31 to .071 in) long. The teeth are acute, 5 to 9 mm (0.19 to 0.35 in) long and 1.5 to 3 mm (0.06 to 0.12 in) wide at the base. The corolla is yellow to dull brownish-pink, magenta, or red, moderately pubescent externally and glabrous within. The corolla tube is straight or slightly falcate, 1.1 to 1.9 cm (0.43 to 0.75 in) long, with the upper lip 5 to 10 mm (0.19 to .039 in) long, and the lower lip 2 mm (0.08 in) long. Mature nutlets unknown.