An undershrub, producing erect shoots, ultimately woody at the base and 2–3 ft. high, from a creeping rhizome, glabrous in all parts; stems terete with prominent lines on the sides alternating with the leaves. Leaves subsessile, oblong to lanceolate-elliptic, acuminate, acute or subacuminate at the base, 4–7 in. long, 1 1/2–2 3/4 in. broad, pale green, herbaceous; secondary nerves 8–12 on each side, oblique; veins obscure. Flowers in few-flowered dense sessile axillary (pseudoaxillary?) clusters; bracts ovate, acute to caudate, up to 2 lin. long, herbaceous. Sepals ovate to ovate-lanceolate, acuminate, 2–3 lin. long, herbaceous, with several minute basal glands within. Corolla white; tube over 2 in. long, slender, cylindric up to 8 lin. above the base then funnel-shaped-campanulate, about 3/4 in. wide at the mouth, quite glabrous except for a minute tuft of hairs below each anther; lobes somewhat asymmetric, about 7 lin. long, 8–9 lin. broad. Stamens inserted 7 lin. above the base, 2 3/4 lin. long. Style 4 1/2 lin. long, filiform; stigma cylindric, 2 lin. long, minutely apiculate.
