Large herb or shrub to 3 m tall; the stems terete, becoming angulate and canaliculate near the apex. Leaves petiolate; the petiole 1-2 cm long, amplexi-caul; lamina elliptic to obovate, basally cuneate, apically acuminate to 15 cm long and 6 cm wide, membranous to thin-chartaceous with 2-4 pairs of ascend-ing lateral veins, the costa prominent beneath, glabrous. Inflorescences terminal and axillary, open, borne in simple or compound, few-flowered dichasia; the peduncles to 4 cm long; the pedicels 0.8-1.8 cm long; the bracts opposite, to 3 mm long. Flowers 4.2-5.4 cm long; calyx tubular, 6-10 mm long, the lobes lanceolate, carinate, long-acuminate at the apex, 4-7 mm long; corolla 4.2-6 cm long, tubular, the tube bright yellow, the lower '/l constricted, the lobes green, ovate, acuminate, 6-8 mm long and ca. 3-4 mm wide at the base, erect; stamens equalling the lobes or shortly exserted, the filaments filiform, inserted on the corolla tube ca. 1/4 from the base, 3.6-4.8 cm long, the anthers 4-5 mm long, the apical mucro to 0.5 mm long, curved; ovary narrowly ovoid, inconspicuously 4-angulate at the base, 8-12 mm long, ca. 2-3 mm in diameter, the style included to shortly exserted, the stigma capitate. Capsule fusiform, 12-14 mm long and 3-4 mm in diameter, with a beak to 4 mm long; seeds irregular.
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