Subshrubs to 70 cm tall, variable from hirsute to subglabrous, weakly anisophyllous. Stems slender, erect or ascending, 4-angled, much branched, villous to subglabrous. Petiole 0.5-3 cm; leaf blade ovate, ovate-elliptic, or subrhomboidal, 2-9 × 1.5-4.5 cm, both surfaces thinly to densely pilose, abaxially paler, adaxially with linear cystoliths, secondary veins 5 or 6 on each side of midvein, base broadly cuneate, slightly oblique, and usually decurrent onto petiole, margin crenulate, apex acute. Inflorescences terminal, spikes, usually 3-8 cm; bracts at base of spike resembling sessile reduced leaves; floral bracts oblong to spatulate, 6-7 × 1-2 mm, persistent, abaxially gland-tipped pubescent to subglabrous; bracteoles linear, ca. 7 × 0.8 mm, abaxially gland-tipped pubescent to subglabrous. Flowers paired, varying considerably in density, basally distant on rachis but apically becoming imbricate. Calyx 8-11 mm, subequally 5-lobed almost to base; lobes linear, 6-7 mm, outside gland-tipped pubescent to subglabrous. Corolla light purple, blue, or white, funnel-shaped, 1.7-2.3 cm, outside pubescent, inside glabrous except for trichomes retaining style; tube basally cylindric and narrow for 3.5-6 mm then bent and gradually widened to ca. 1 cm at mouth; lobes orbicular, ca. 2 mm in diam., spreading. Fertile stamens 2, staminodes 2; filaments ca. 3.5 mm, pubescent; anther thecae ovoid-oblong, exserted; pollen type 15. Ovary oblong, glabrous but with a few apical glands; style ca. 2 cm, glabrous. Capsule oblong, 7-10 mm, glabrous apart from a few apical glands, 4-seeded. Seeds suborbicular in outline, ca. 2 × 2 mm, densely villous; areola small. Fl. Jan, Apr, Jul-Oct.
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