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Subshrub, or ± herbaceous, 0.9–1.8 m. tall; stems ± square, shortly pubescent.. Leaves broadly ovate, 6–29 cm. long, 5–28 cm. wide, acute or acuminate at the apex, truncate to widely cordate at the base, usually coarsely serrate, sometimes 1–3-lobed, rather sparsely pubescent; petiole 2–23.5 cm. long.. Flowers strongly scented, in terminal compact many-flowered cymes 3–6 cm. long, 3.5–9 cm. wide; bracts lanceolate, leafy, scattered throughout the cymes, 1.5–3 cm. long, 0.3–1.2 cm. wide, acuminate.. Calyx usually red or purple, campanulate, 1–1.5 cm. long; lobes lanceolate, 4–10 mm. long, acuminate.. Corolla white or pink, funnel-shaped in common ‘flore pleno’ form but hypocrateriform in the single wild form, 1.5–2 cm. long.
A shrub that loses its leaves during the year. It grows 1.2 m high and spreads 1.5 m wide. It produces vigorous root suckers. The branches are downy. The leaves are broadly oval and taper to the tip. They are 12.5 cm long. There are shallow teeth around the edge. The flowers are white and fragrant. They are tube shaped.
