Herbs, weak to suberect, to 60 cm tall; stems glabrous to pubescent. Leaves in subequal pairs; petiole 0.5-2(-4) cm, densely pilose; blade drying thinly papery, red on both surfaces or grayish green adaxially, lanceolate to ovate, 3-11 × 1-4 cm, glabrous or sparsely strigose adaxially, ?pilose along principal veins abaxially, base cuneate, margins entire or undulate, apex rounded-obtuse to acuminate or acute; secondary veins 7-13 pairs; stipules sometimes caducous, broadly triangular then strongly narrowed, 2-3 mm. Inflorescence congested-cymose, many flowered, densely pubescent; peduncle 1-6 cm; axes helicoid, up to 1 cm, elongating as fruit develop; bracts absent, minute, or caducous. Flowers reportedly distylous, subsessile. Calyx densely pubescent; hypanthium subobcordate, ca. 1 mm, 5-ribbed; lobes subtriangular, ca. 0.5 mm. Corolla slenderly tubular, 6-8(-12) mm, outside pubescent and 5-ribbed at least in bud, inside with white villous ring at middle and scaly pubescent in throat and onto lobes; lobes triangular to subovate, dorsally narrowly winged and with very short horn. Capsules drying purplish red, obcordate, ca. 3 × 7-8 mm, pubescent. Fl. Apr-Jul.
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