Herbs, annual or perennial, or subshrubs, erect, to 40[-100] cm tall; stems [glabrous to] pubescent. Leaves in subequal pairs; petiole 1-4.5 cm, subglabrous; blade drying thinly papery, adaxially pale green, abaxially paler, elliptic to lanceolate, [3.5-]13-15[-22.5] × [1.5-]4.5-6[-10] cm, subglabrous except pilosulous abaxially along principal veins, base cuneate to obtuse, margins entire, apex shortly acuminate to subacute; secondary veins [8-]10-12[-15] pairs; stipules deciduous, subovate or triangular, [4-]5[-15] mm, at apex with 1 gland. Inflorescence cymose, many flowered, branched to several orders, pilosulous; peduncle ca. 3[-10] cm; axes helicoid, 1-3[-10] cm; bracts minute, caducous. Flowers subsessile or on pedicels to 3 mm. Calyx puberulent to pilosulous; hypanthium subturbinate, ca. 3 mm, 5-ribbed; lobes triangular, ca. 0.5 mm. Corolla yellow to pale yellow, tubular, outside glabrous and 5-ribbed in upper part; tube 5.5-6.5[-12] mm, glabrous inside; lobes ca. 1 mm. Capsules mitriform, ca. 3 × [5-]7.5 mm, puberulent to glabrescent.
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