Stem about 2 ft. high, solitary, simple, slender, 1/2– 3/5 lin. thick at the base, puberulous down one side on the flowering part, glabrous below. Leaves in several pairs, ascending or erect, 2/3–1 2/3 in. long, 1/4–1 1/3 lin. broad, filiform, acute, revolute along the margins, glabrous. Umbels 5–8 to a stem, sessile, lateral at the nodes, 5–8-flowered; pedicels 1 1/2 lin. long, lengthening in fruit, puberulous. Sepals 1 lin. long, 1/2 lin. broad, ovate-lanceolate, acute, thinly adpressed, pubescent on the back. Corolla rotate, lobed almost to the base, apparently whitish or yellowish; lobes 1 2/3–2 lin. long, 3/4–1 lin. broad, lanceolate, acute, thin, slightly undulated along the margins, bearded at the tips on the inner face with a few stiff erect hairs and with a few adpressed hairs on the back, otherwise glabrous. Coronal-lobes arising at the base of the staminal-column and much overtopping it, 1–1 1/4 lin. long including the horn, 2/3 lin. broad, subquadrate, truncate, with a curved subulate simple or irregularly trifid horn arising near the top on the inner face, from the base of which are decurrent the usual pair of keels, but they are very faint in the dried state. Staminal-column 1/2 lin. long.