Herbs, perennial, coarse, to 3 m, ? glabrous. Leaves lanceolate-ovate, the upper ? lanceolate, acute, serrate, the bases obtuse or attenuate, to 13 cm long and 4 cm wide, sparsely pubescent on the veins, resin-dotted; ? sessile. Inflores-cences capitula, dense, axillary, ? globose at maturity, the peduncles 2.5-5 cm long, the bracts lanceolate or awl-shaped, ca 1 cm long, ? glabrous. Flowers + sessile; calyx tubular-campanulate, ca 3-3.5 mm long at maturity, pilose-annulate within above the nutlets, the teeth acicular, ca 3-3.5 mm long, pu-bescent between; corolla tube ca 6-7 mm long, white and purple, the lower lip ca 1.5-2 mm long, lightly pubescent; stamens exserted, the filaments lightly pubescent, the anthers ca 0.4 mm long; ovary 4-lobed, the gynobase slightly elongated, becoming lobed, the style minutely bifid near the tip. ?Nutlets 4, oblong-flattened, the lobes of the gynobase sometimes adhering, ca 1.5-1.7 mm long, brown.
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