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Stem slender, simple, thinly hairy. Leaves long-petioled, cordate-orbicular, with 3–4 broad deep teeth on each side, membranous, glabrous, the lower 1–1 1/4 in. long and broad. Panicle racemose, very lax, terminal, 1/2 ft. long; central whorls 3–4-flowered; pedicels reaching 1/4– 1/3 in. long. Fruit-calyx 1/8 in. long, glabrous; tube campanulate; upper tooth ovate, as long as the tube; 2 lateral short cusps; 2 lower longer cusps. Corolla 1/2 in. long; lower lip oblong-navicular, rather shorter than the tube.