Annual, patulous-villose, viscid, 25-50 cm. Sterns dichotomously branched, fairly thick below. Leaves 1-7 x 0.5-1 (-1.5). cm., the lower larger, sessile, somewhat connate at base, oblong-lanceolate to linear, acute, 3-nerved. Inflorescence a divaricately branching panicle. Bracts short, narrowly linear-lanceolate, hairy beneath. Pedicels 3-6 times as long as calyx, filiform. Calyx 4-5 mm., oblong-campanulate, later sub-spherical, hispid, deeply parted into oblong, white-margined lobes. Petals 6-8 mm., white, oblong-cuneate, retuse. Capsule about as long as calyx, globular, deflexed. Seeds 1.5 mm., tuberculate. Fl. March-May.