Herb, up to 30 cm tall. Branches quadrangular. Leaves sessile, opposite; blade linear or narrowly obovate, 0.2-1.5 x 0.03-0.3 cm, apex acute or obtuse, base cuneate, venation hardly visible, 1-3-veined from base; lowest pair of leaves often broadly ovate to almost circular. Inflorescence loose, simple or repeatedly branched, 1-many-flowered dichasium, pedicels 0.5-3 mm long. Flowers homostylous; calyx 2-4 mm long, lobes lanceolate, apex acuminate, margin sometimes slightly denticulate; corolla white or yellow, or tube yellow and lobes white, tube cylindrical2.5-4.5 mm long, often slightly narrowed in upper part, lobes obovate to orbicular, 0.8-2 mm long, apex obtuse or slightly acute; filaments 0.3-0.5 mm long, anthers oblongoid, 0.4-0.6 mm long, connective not prolonged above thecae; pistil 1.5-2.5 mm long, ovary oblongoid or ovoid, stigma 2-lobed, oblongoid, 0.3-0.7 mm long, papillose. Fruit oblongoid, 2.5-5 mm long; seeds globose to conical, irregular, 0.1 mm.
French Guiana present, Guyana present, Southern America: Bolivia (Bolivia present); Colombia (Colombia present); Costa Rica (Costa Rica present); Venezuela (Venezuela present), Suriname present
Costa Rica to Colombia, Venezuela, French Guiana, Brazil, Bolivia and probably in Guyana and Suriname; 9 collections studied (FG: 9).