Stem erect, terete, somewhat woody, very minutely puberulous, with a brown bark; internodes 3/4–1 in. long. Leaves in whorls of 3, spreading (or alternate and ascending); petiole 2–2 1/2 lin. long; blade 2 1/3–2 2/3 (3–4 1/4) in. long, 1 1/2–2 (1 1/2–4) lin. broad, linear, very acute and pungent-mucronate at the apex, cuneate or slightly rounded at the base, glabrous, with minute fleshy acute processes scattered along the midrib above, minutely white-tomentose beneath, reticulately veined on both sides, narrowly revolute along the margins. Cymes axillary, usually from 2 axils of each whorl, ascending, puberulous, trichotomously branched, 11–15 flowered; peduncle 1/3–1 in. long, slender; branches 3–5 lin. long; bracts 1/2–1 lin. long, lanceolate, acute; pedicels 2–4 lin. long. Sepals 3/4–1 lin. long, 1/2– 2/3 lin. broad, ovate, acute, puberulous. Corolla lobed to 1/2 lin. above its base, quite glabrous; lobes 2 lin. long, 3/4 lin. broad, oblong, subobtuse. Coronal-lobes about 1/2 lin. long, stoutly subulate, acute or obtuse, very thick and fleshy, incurved, inserted with the stamens at the middle of the very short corolla-tube, but adnate up to the sinuses of the latter; at their base are 2 small obtuse lobules embracing the staminal filaments. Staminal-column about 2/3 lin. long; anthers connivent over the apex of the style, connate at their tips, glabrous.