Subshrubs to 1 m tall, anisophyllous. Stems and branches 4-angled, sulcate, tomentose. Petiole 2-10 mm, sulcate, tomentose; leaf blade ovate-elliptic, smaller one 1.2-4 × 0.6-1.4 cm and larger one 3.5-18 × 1.6-6.5 cm, both surfaces tomentose, secondary veins 5-7 on each side of midvein, base cuneate and oblique, margin crenulate-serrate, apex acuminate and falcate. Inflorescences axillary, capitate, few flowered; peduncle 0.2-1 cm, pubescent; bracts variable in size and shape; outermost bracts leaflike, pandurate with a constricted middle and broad petiolar base, 3-4 × ca. 0.5 cm; inner bracts lanceolate, 13-20 × ca. 3 mm, abaxially tomentose, apex acute; bracteoles linear, ca. 2 × 0.3 cm, abaxially apically pubescent. Calyx ca. 1.4 cm, subequally 5-lobed almost to base; lobes linear, outside apically pilose, apex acute. Corolla white, ca. 4 cm, straight, outside glabrous, inside glabrous except for trichomes retaining style; tube basally cylindric and ca. 2.5 mm wide for ca. 8 mm then gradually widened to ca. 1.8 cm at mouth; lobes oblong, ca. 6 × 5 mm, apex rounded. Stamens 4, included; shorter filament pair ca. 3 mm, glabrous; longer filament pair ca. 1 cm, hirsute; anther thecae oblong, ca. 2 × 1 mm, base divaricate, apex apiculate; connective shortly excurrent. Ovary glabrous; style ca. 3.2 cm, hirsute. Capsule clavate, 1.8-2 cm, glabrous, 4-seeded. Seeds ovate in outline, ca. 3 × 2 mm, densely pubescent. Fl. Mar-Aug.
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