Subshrubs 1-2 m tall, pliestesial, anisophyllous. Stems and branches 4-angled, sulcate, glabrous or thinly pubescent. Petiole 2-14 mm or leaves sessile, glabrous; leaf blade ovate to narrowly ovate-elliptic, 12-20 × 4-7 cm, abaxially pale, adaxially glabrous with abundant cystoliths, secondary veins 5-7 on each side of midvein, base cuneate and decurrent onto petiole, margin serrate, apex long acuminate and usually falcate. Inflorescences axillary, simple or branched spikes, 3-9 cm; floral bracts variable in shape, ovate, elliptic, oblanceolate, or spatulate, 4-6 × 2-3 mm, caducous, glabrous or gland-tipped pubescent; bracteoles linear, ca. 2.5 × 0.8 mm, caducous. Flowers imbricate on rachis or to 1 cm apart. Calyx 5-9 mm, accrescent to ca. 1.3 cm in fruit, subequally 5-lobed almost to base; lobes linear, glabrous or pilose, apex acute. Corolla purple, funnel-shaped, 2.5-3.2 cm, curved, outside pubescent, inside glabrous except for trichomes retaining style; tube basally cylindric and ca. 2 mm wide for ca. 1 cm then curved and widened to 1-1.3 cm at mouth; lobes ovate, ca. 4 × 4 mm, apex rounded. Stamens 4; filaments glabrous, shorter pair ca. 2 mm and strongly incurved, longer pair 3.5-4 mm; anther thecae subspherical, ca. 1 mm, incurved; pollen type 3. Ovary pubescent; style 2.5-3 cm, basally thinly pilose, apically glabrous. Capsule narrowly obovoid, gland-tipped pubescent, 4-seeded. Seeds orbicular in outline, ca. 2 mm in diam., densely covered with appressed trichomes. Fl. Sep-Nov.
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