Stems 2–3 ft. high, slender, simple or rarely branched, bifariously pubescent. Leaves subsessile or on petioles 1/2–1 lin. long, erect, 1 1/2–3 in. long, 1/2–2 lin. broad, linear, acute, minutely pubescent, becoming glabrate with age, revolute along the margins. Umbels lateral, sessile, 3–8-flowered; pedicels 1–2 lin. long, pubescent. Sepals 1 lin. long, lanceolate, acute, pubescent. Corolla rotate; lobes 2 1/2 lin. long, 3/4 lin. broad, oblong-lanceolate, acute, more or less reflexed, glabrous on the back, pubescent all over on the face, purple-brown. Coronal-lobes arising at the base of the staminal-column, purple-brown; basal part subquadrate, 3/4 lin. long, 1 lin. broad, with two keels on the face, 3-toothed at the apex; lateral teeth very short; middle tooth prolonged into an erect recurving horn 1 1/2 lin. long, with a similar horn of about the same length arising at its base in front of it.
