Subshrubs 0.5-2.5 m tall, much branched, isophyllous. Stems 4-angled, bifariously whitish pubescent, sometimes glabrescent. Petiole 2-4 cm, whitish pubescent; leaf blade ovate, elliptic, or elliptic-ovate, 3-11 × 2-5 cm, abaxially pale green and sparsely pubescent, adaxially dark green and pubescent, cystoliths abundant on both surfaces, secondary veins 4-7 on each side of midvein, base narrowly cuneate and decurrent onto petiole, margin crenate-serrate, apex acuminate and sometimes falcate. Inflorescences axillary or terminal, subcapitate spikes, rarely reduced to a single flower; peduncle 0-4 mm, densely white pubescent; bracts persistent, hirsute; outermost sterile bracts leaflike, petiolate, lanceolate to ovate-lanceolate, 1.5-2.5 × 0.3-0.4 cm; inner floral bracts linear-oblong, 1.2-1.6 cm, with 1 reddish brown vein; bracteoles linear to oblanceolate, ca. 10 × 2 mm, pilose, apex obtuse. Flowers usually only one sterile per node. Calyx 1.2-1.6 cm, 5-lobed almost to base; lobes linear-lanceolate, 11-15 × 1-1.5 mm, subhyaline, pilose especially on midvein, margin ciliate, apex finely acuminate. Corolla pale blue to pinkish, 3.5-4.5 cm, straight, outside densely white pilose, inside glabrous except for trichomes retaining style; tube basally cylindric and 8-9 mm wide for 1-1.5 cm then gradually widened to ca. 2 cm at mouth; lobes orbicular, 6-8 mm in diam. Stamens 4, included; filaments pilose, shorter pair ca. 2 mm, longer pair 4-7 mm; anther thecae oblong, ca. 4 × 1 mm; pollen type 3. Ovary whitish comose; style 2.8-3.4 cm, sparsely pilose. Capsule oblong, 11-13 × ca. 2.5 mm, apically sparsely gland-tipped pubescent, 4-seeded. Seeds ovate in outline, 2.5-3.5 × 2-2.5 mm, densely appressed pilose. Fl. Jul-Sep, fr. Oct-Nov.
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