Herba annua, 10-15 cm. alta, glabra. Caulis hand ramosus, erectus, quadrangularis, angulis laevibus. Folia sessilia, 6-8-nata, anguste lanceolata, oblanceolata vel cuspidata, 12-25 x 1.5-2 mm., costa distincta, marginibus recurvis. Pedunculi breves, axillares, 1-3-flori, demum in fructu ± 5 mm longi. Flores albi; coronae lobi ovati, acuti, ± 1.5 mm longi; pedicelli 2-3 mm longi demum in fructu decurvi. Frnctus glaber, ± 2-4 mm diametro, saepe rhaphidibus albis piliformibus immersis provisus. Mericarpia (1-) 2.

Annual, 10-15 cm tall herb, whole plant glabrous. Stem unbranched, erect, 4-sided, angles perfectly smooth. Leaves sessile, 6-8 in a whorl, narrowly lanceolate-oblanceolate or cuspidate, 12-25 x 1.5-2 mm, midrib distinct, margin recurved. Peduncles short axillary, 1-3-flowered, c. 5 mm long in fruit. Flowers white. Corolla segments ovate, acute, c. 1.5 mm long, pedicel 2-3 mm long, decurved in fruit. Fruit glabrous, c. 2-4 mm in diameter, often with sunken hair-like raphide crystals, mericarps (1-) 2.