Herbs, annual, slender, procumbent to weak, 4-20 cm tall. Roots slender, reddish when dry. Stems slender, 4-angled, somewhat branched, sparsely retrorsely aculeolate to glabrous. Middle stem leaves opposite with clearly smaller, leaflike stipules in whorls of 4; blades drying papery, obovate or oblanceolate to linear-elliptic, (2-)3.5-10(-12) × 1-3.5(-5) mm, adaxially with sparse appressed hairs or glabrous, margins mostly antrorsely ciliolate, otherwise glabrous, base acute, cuneate, or shortly petiolate, apex obtuse to acute but not mucronate; principal vein 1, with inconspicuous pinnate-reticulate lateral veins. Flowers mostly solitary; pedicels 1-3 mm, glabrous. Ovary subglobose, ca. 1 mm, densely covered with undeveloped trichomes. Corolla white, rotate, 1-1.5 mm in diam.; lobes 3(or 4), ovate, obtuse. Mericarps ovoid to elongated, 2-2.5 mm, with dense, white to yellowish brown, uncinate trichomes 0.2-0.5 mm, on pedicels elongating to 10 mm and curved near apex. Fl. Jun-Jul, fr. Aug-Sep.
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