Herbs to 80 cm tall, branched, anisophyllous. Stems black when dry, 4-angled, glabrous, winged between nodes, wing 0.5-2 mm wide. Leaves sessile; leaf blade elliptic, rhombic-elliptic, obovate, or ovate, 6.5-20.5 × 4-8.5 cm, abaxially glabrous except sparsely pilose along veins, adaxially pubescent and densely covered with cystoliths, secondary veins 5-9 on each side of midvein and prominent on both surfaces, basally attenuate to rarely broadly cuneate, base auriculate, amplexicaul, and decurrent onto petiole, margin crenate, apex acute to acuminate. Inflorescences axillary or terminal, subcapitate, 2.5-3.5 × 2-2.5 cm, elongating after flowering; peduncle 1-4 cm; bracts ovate, ca. 2.2 × 1.5 cm, abaxially puberulent, base cordate, margin deeply crenate, apex acute; bracteoles elliptic, 1.4-1.6 × ca. 0.7 cm, margin undulate, apex obtuse to emarginate. Calyx ca. 1.2 cm, accrescent to ca. 1.8 cm in fruit, subequally 5-lobed; lobes oblanceolate, puberulent, lower 2 ca. 9.5 mm and connate at base, upper 3 ca. 1.2 cm and extremely shortly connate. Corolla white with purplish stripes on upper lobes, ca. 4 cm, slightly curved, outside glabrous; tube basally cylindric and narrow for ca. 1 cm then gradually widened to ca. 2 cm at mouth; lobes oblong, ca. 5 × 5 mm, apex subrounded. Stamens 4, included; filaments pilose, shorter pair ca. 2.5 mm and basally sparsely pilose, longer pair ca. 5 mm; anther thecae oblong, 3-4 mm. Ovary glabrous; style ca. 2.5 cm, pubescent; stigma unequally 2-lobed. Capsule ellipsoid, ca. 1.8 cm, glabrous, 4-seeded. Seeds ovate in outline, ca. 2.5 × 2.5 mm, densely appressed pilose. Fl. Jul.
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