Erect shrub, up to 2.5 m high. Branches subterete, c. 0.5 cm ø, glabrous. Leaves chartaceous, elliptic, obovate, rarely ovate, 12-29 by 5-15 cm; apex acuminate; base cuneate or acute; glabrous above, sparsely puberulous or pubescent, sometimes seemingly glabrous beneath; basal nerves 2 pairs, the inner one similar to lateral nerves, extending upward to about halfway, the outer one weak, short, close to the margin; lateral nerves 6-9 pairs, elevated and prominent below, less so above; veins transverse or ± parallel and reticulate, slightly elevated on both surfaces; petiole 5-10 mm, glabrous. Inflorescences at the basal part of the stem, in the axils of leaves or fallen leaves, or cauliflorous, simple or sparsely branched, up to 4 (-7) cm long, pubescent; bracts lanceolate, oblanceolate or elliptic, 6-9 mm long, densely puberulous on both surfaces. Pedicel and ovary 7-15 mm long, pubescent. Perianth pale yellow with center and margin streaked with claret-colour, brown, deep reddish pink, dark purple out-side and pink inside, or purple; campanulate, contracted at the lower ⅓ and then erecto-patent, 15-25 mm long, c. 25 mm ø, glabrous on both surfaces; tube urceolate, c. 10 mm long; lobes triangular, 6-10 (-15) by 10-15 (-25) mm, acute, each with longitudinal (c. 7) and reticulate veins. Stamens in 2 whorls: upper row 7-10, lower 13-16; filaments glabrous, 1-2 mm; anthers oblong, c. 1.5 mm long. Style column c. 4 mm long; lobes (4-) 6-9, spreading, c. 3 mm long. Capsules slender, 5-10 cm long, 4-angular, straight or slightly twisted at the apical part. Seeds ellipsoid, trigonous, 3-4 mm long, acute at both ends, rugose-tubercled.
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