Erect or decumbent annual herb, stems smooth, quadrangular. Leaves sessile, petiolate, 6-8 in a whorl, 2–5 (–9) x 0.4-1 (–1.5) cm, narrowly elliptic, lanceolate or obovate, spathulate or broadly elliptic, acute, acuminate or apiculate, midrib distinct, glabrous, margins scabridulous. Inflorescence a few flowered terminal cyme, peduncles and pedicels mostly slender, glabrous; flowers minute, corolla white, bracts linear. Fruit c. 2 mm long, globose, covered with long hooked bristles, pedicel enlarged up to 5 mm in fruit.