Stems erect, branched, up to 3 ft. high, sparingly branched, like the whole plant softly glandular-hairy, terete below, obscurely quadrangular above, internodes rarely over 1 1/2 in. long. Leaves lanceolate to narrowly elliptic, subobtuse or apiculate, cuneate at the base, entire or obscurely repand, 1–2 in. long, 2–6 lin. broad, dull green, at length glabrescent, with very few sessile glands among the hairs; petiole very slender, up to 1/2 in. long, upper very short. Pedicels very short, in fruit 2 lin. long; nectaries stipitate. Calyx 2 lin. long, linear-lanceolate. Corolla tubular-campanulate, rose-violet or purple, about 1 in. long; throat 3–4 lin. wide; limb 1/2 in. in diam.; lowest lobe 3 lin. long and broad, suborbicular, apiculate. Capsule 3/4–1 in. long, rounded-quadrangular, deeply 4-sulcate, hairy, beak acuminate. Seeds 1 1/2 lin. long, very strongly compressed, margins narrowly winged, faces finely granular.
