Terrestrial herb, 20-50 cm tall. Stem sappy, erect, decumbent at base, sparsely villose. Leaves subequal in a pair; petiole 2-3 cm long, sparsely villous; blade membranous when dry, oblong-elliptic, 11-18 x (3.5-)4.5-7 cm, margin closely crenate-serrulate, apex acute, base acute, above and below sparsely villous. Flowers 2-6, in epedunculate fascicles; pedicel 0.8-2 cm long, densely villous. Calyx lobes connate at base, erect, unequal, lanceolate to linear-lanceolate, 1-1.5 x 0.2 cm, margin with 0-4 thickened teeth, apex narrowly acute, outside densely villous, inside sparsely villous; corolla oblique in calyx, red, 3.5-5.5 cm long, tube narrowly infundibuliform, 3.3-5 cm long, base spurred, 0.3-0.4 cm wide, middle slightly enlarged, throat not contracted, 0.5 cm wide, outside densely villous except at base, inside glabrous, limb 1.5 cm wide, lobes subequal, spreading, suborbicular, 0.5-0.6 x 0.5-0.6 cm, margin wavy-serrate; stamens included, inserted at base of corolla, adnate for 0.9 cm; ovary narrowly ovoid, 0.45 x 0.2 cm, densely sericeous, style 1.8-2 cm long, glabrous, stigma 2-lobed. Mature capsule ovoid, 2 x 1 cm.
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