Perennial herb, stem unbranched, woody, to 25 cm long, glabrous except for dense dark uniseriate, multicellular hairs, ca 0.5 mm long, on upper portion of petioles, on the lower surface of midrib and on peduncles. Leaves opposite, clustered in a rosette at the top of the stem; petioles 1–4 cm long; lamina lanceolate-oblong, 9–18.5 × 3–5.5 cm, glossy above, slightly paler beneath, base attenuate, margin undulate, very coarsely serrate, teeth to nearly 1 cm long, broad and blunt, apex acute; midrib and veins impressed above, prominent beneath, lateral veins (10–)12(–16) pairs. Inflorescence single-flowered, peduncle slender, pale green, 5–8 cm long; bract pair lanceolate, 2–3 × 1–2 mm; pedicels 2.5–3 cm; sepals light green, divided to base, lanceolate, 5–7 × ca. 1 mm, apex acute; corolla trumpet-shaped; tube white outside, dark red within, ca. 4 cm long, ca. 5 mm wide at base dilating to 10–15 mm wide at the mouth, outside finely pubescent, throat and lobes dark red, nectar guides raised and slightly darker, inner surface of throat finely velvety; lobes 5, upper two lobes reflexed, ca. 5 x 10 mm and lower three lobes extending beyond the upper, ca. 5 × 12 mm; stamens with filaments 2–2.5 cm long, anthers white, ca. 1 × 1 mm, connective small and horn-like, staminode vestigial; ovary and style ca. 3 cm long, stigma broadly triangular, white. Capsules curved downwards, glabrous, 5–6 cm long, ca. 3 mm thick, sepals not persisting.
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