Sprawling herb, to 70 cm long; younger stems and petioles densely pubescent. Petioles 1-4 cm long; blades ovate, acute at apex, obtuse to truncate at base, 2-15 cm long, 1.5-10 cm wide, sparsely pubescent above and on veins below, resin-dotted below, crenate, sometimes variegated. Inflorescences terminal, branched, 15-30 cm long; flowers in cymes, purplish; pedicels 1-2 mm long; calyx ca 2 mm long, resin-dotted, unevenly lobed and toothed; corolla ca 1 cm long, the tube recurved, the upper lip bilobed, the lower lip entire, enlarged, boat-shaped; stamens 4; style bifid near apex. Nutlets 4, ca 1 mm diam. Shattuck 158. Formerly cultivated at the laboratory; not seen in recent years, but so commonly cultivated in Panama it is included here. Seasonality uncertain. Possibly flowers and fruits year-round.