Mexican mint is a sprawling and somewhat succulent herb, growing to 1 m tall. The plant is sometimes prostrate at the base, with the branchlets rising up, densely hairy. Leaves have stalks 1-4.5 cm long, densely velvety, like most mint family plants. Leaf-blade is fleshy, broadly ovate to circular, rhombic, or kidney-shaped, 4-10 cm long, 3-9 cm broad, coarsely toothed at the margin or entire toward the base. Flowers are borne in 10-20-flowered, densely velvety spikes, 10-20 cm long. Flower stalks are slender, up to 5 mm long. Flowers are pale blue or mauve to pink, 8-12 mm long – the upper lip is up to 4.5 x 3 mm, erect, the lower lip up to 5-6 x 4 mm, concave. Filaments of stamens are mostly fused into a tube around style.