Annual 1-2 m tall, very viscid. Young shoots densely glandular-hairy. Lvs with wingless petiole 2-5 cm long. Lamina to c. 20 × 11 cm on lower lvs, becoming smaller towards the infl., broadly ovate-oblong to almost elliptic, puberulent and somewhat glandular-scaly; base truncate; apex obtuse to rounded. Panicle with several open branches, many-flowered. Fls not fragrant. Calyx 1-2.2 cm long; teeth 2-8 mm long, unequal, ovate or broadly ovate, densely glandular-hairy, obtuse to acute. Corolla 1.5-2 cm long, ± funnelform-campanulate, puberulent outside but scarcely glandular; tube pale green; lobes 2-3 mm long, shallow and wide, greenish yellow, crinkled, becoming somewhat reflexed, obtuse or mucronate. Capsule 1-1.5 cm long, broad-ovate. Seed c. 1 mm long, ± broad-reniform, undulately ridged.