Herbaceous plants up to 0.5 meters high; stems subquadrangular, glabrous or sparingly pilose, the cystoliths minute and numerous; leaf blades narrowly oblong, acute or obtusish at apex, narrowed at base and decurrent on the petiole, up to 13 cm. long and 3.8 cm. wide, rather firm, entire or undulate, both surfaces glabrous or the costa and basal margins bearing a few white spreading hairs 1.5 to 2 mm. long, the cystoliths numerous and conspicuous under a lens; petioles up to 2 cm. long, sparingly long-pilose; flowers borne on once to twice dicho- tomously branched peduncles, these up to 8 cm. long, their branches 4 to 2 cm. long, all subquadrangular and glabrous, bearing conspicu- ous cystoliths, the ultimate forks flower-bearing; bracts linear, about 1 cm. long and 1.5 mm. wide at base or the uppermost smaller, all glabrous; calyx 13 to 15 mm. long, divided nearly to the base, the segments subulate, 1.25 mm. wide at base, gradually narrowed to tip and bearing minute scattered hairs on or near the margins, some of the hairs gland-tipped; corolla 5.5 cm. long, minutely pubescent, mauve, the tube about 4 mm. broad at base, gradually narrowed to 2 mm. at 1 cm. above base, thence enlarged to 2 cm. at mouth, the throat funnelform and somewhat ventricose, the limb 4 cm. broad, the lobes oval, about 1.5 cm. long and broad; capsules narrowly clavate, 23 cm. long, 8- to 20-seeded, glabrous or the apical calluses puberulous, the solid basal portion about 6 mm. long and 2 mm. broad, the seed-bearing portion 6 mm. broad; seed suborbicular, about 3 mm. in diameter, silky with white appressed hairs when dry but mucilagi- nous-pilose when moistened; retinacula 2 mm. long, slightly curved.