Suffrutescent herbs, shrubs or weak trees; stems usually elongate and coarse, woody, erect, terete to subquadrangular, pith usually large, brown to gray at maturity, glabrescent; few to many branches. Leaves opposite, nearly equal in a pair, often large, membranous, ovate to elliptic, dentate or serrate, usually dark green and pubescent to pilose above, lighter green or reddish brown and pubescent usually along the veins beneath, the lateral veins 7-10, arching toward the apex; petioles usually elongate, occasionally as long as the blades, green to reddish brown, glabrous to pilose. Inflorescences numerous in the leaf axils, usually pedunculate, about '/2 the length of the subtending leaf; peduncles and pedicels slender, terete, green to reddish, glabrous to pilose, bibracteate. Flowers zygo-morphic, large and showy, solitary or few per inflorescence; floral tube surround-ing the ovary, glabrous to pilose; calyx of 5 lobes connate at the base, exceeding the ovary; corolla with an elongate tube, not spurred, yellow to orange or reddish orange, glabrous to pilose, the throat ampliate, the limb of 5 lobes, often spotted, suberect, broad; stamens 4, adnate to base of the corolla tube, rarely exserted, the filaments elongate, curved, broad at the base, the anthers coherent, dehiscent by longitudinal slits, the staminode small; nectary of one bilobed gland or 2, 3, or 5 glands; ovary inferior, the apex flattened or convex, the style equalling the stamens, elongated, flattened, broader toward the apex, the stigma stomato-morphic, the ovules numerous on both sides of the placental lamellae. Fruit a dry capsule surrounded by the persistent calyx; seeds fusiform, dark brown, striate.
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