Shrubs or small trees, 1.6–4.5(–12) m tall; young shoots stout, pale green, glabrous. Petiole cylindric, 13–23 mm, glabrescent; leaf blade leathery, oblong-lanceolate, 7–14 × 1.8–3.5 cm; base cuneate; apex acute or cuspidate; both surfaces glabrous; abaxial surface grayish green; adaxial surface dark green, midrib prominent abaxially, grooved adaxially, lateral veins 16–20-paired, prominent adaxially. Inflorescence racemose, 10–13-flowered; rachis greenish, 30–35 mm, glabrescent. Pedicel 3.5–4.2 cm, glabrous; calyx purple, lobes 7, 3–5(–10) mm, rounded, glabrous or gland-fringed; corolla campanulate, red to purple or lilac, ca. 3.5 cm, glabrous; lobes 6 or 7, suborbicular, ca. 1.6 × 1.8 cm; apex entire; stamens 12–14, unequal, 1.3–2 cm, filaments glabrous; ovary conoid, ca. 7 mm, densely glandular-hairy; style ca. 2.1 cm, glandular to tip; stigma capitate, ca. 2.5 mm in diam. Capsule oblong, 15–30 mm, with some glands; calyx persistent. Fl. May–Jun, fr. Sep–Oct.
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