Monoecious annual herb, commonly with a thick prostrate root, usually forming dense mats; stems usually villous above and glabrous below, often reddish-brown; sap +/- milky. Leaves opposite, simple; stipules distinct, linear, toothed; blades oblong-elliptic, rounded to acute at apex, rounded to subcordate and inequilateral at base, 4-10 mm long, 2-5 mm wide, glabrous above, glabrous to sparsely pubescent below, inconspicuously serrate. Flowers naked, the cyathia 1 to several in axils of lateral branches, the glomerules less than 4 mm wide; disk with glands broadly elliptic to rounded, reddish; stamen 1; styles 3, bifid. Capsules long-ovoid, appressed-pubescent, to 1.3 mm long, not fully exserted but splitting cyathium at maturity; seeds conical-ovoid, to 1 mm long, 4-angled, tan. Croat 16527. Collected once on the mossy sides of a concrete drainage ditch near the laboratory. Flowers and fruits throughout the year, especially during the rainy season.