Subshrub, 0.5 m tall;  mature stems terete, smooth, lustrous, glabrous; twigs subterete to bluntly angled, striate, puberulent, glabrate.  Leaves in whorls of 3, strongly imbricate, ascending to spreading at tips, oblong-elliptic, ± trigonous in cross-section, 3.2-5.2 x 1-1.4 mm, base broadly cuneate and decurrent, apex acute, short-mucronate, keeled, apparent margins short-ciliate with white hairs to 0.2 mm long, otherwise lamina glabrous except for puberulous base;  petiole 1.5-2 mm long, puberulous.  Inflorescence axillary, flowers solitary;  pedicels subterete, ribbed, to 4 mm long, densely short-white-puberulent;  floral bracts not seen;  bracteoles located about in middle of pedicel, ca. 4 mm long, apex long-mucronate.  Flowers 5-6-merous; calyx campanulate, ca. 6 mm long, puberulent, lobes spreading, ovate, ca. 5.5 mm long, acuminate, mucronate, margin with very tiny, deciduous, acicular (branched), eglandular hairs ca. 0.1 mm long;  petals apparently spreading, oblong-elliptic, ca. 6 x 1.5 mm, rounded, white when fresh, glabrous;  stamens ca. 5 mm long;  filaments ca. 3.6 mm long;  anthers ca. 1.3 mm long;  ovary glabrous;  style ca. 1.3 mm long, glabrous.  Capsule oblong, ca. 4 mm long.

     Distribution (Map).  Endemic to Venezuelan Guayana, where it is known only from the type collection from along a rocky stream edge.  Rare.