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Leaves 5-8·5 mm. long, linear or linear-lanceolate, usually with nearly the same breadth from base to apex, the cauline and rameal ones blunt or truncate at the apex which is provided with ± numerous short papillae, entire, sessile and connate at the base into a sheath up to 0·5 mm. long, not spurred below their insertion with the stem; axillary-fascicles distinctly shorter than the subtending leaf.
Stems up to 22·5 cm. long, ± 1 mm. in diam., soft, distinctly 4-winged (at least when dried), whitish to pale green, the wings hyaline, simple or branched sometimes from the base (the branches ascending or erect, shorter than the main stem), leafy nearly from the base to the apex or leafless below; internodes usually longer than the leaves, the lower and median ones up to 14 mm. long.
Corolla 0·6-1 mm. long, white or pale pink, thinly membranous, hyaline to brownish on drying; petals ovate-lanceolate or ovate, folded above the middle and thus attenuate and cuspidate, nearly free, stellate.
Flowers (4)5-merous in 2-7-flowered axillary fascicles nearly along all the stem and branches or sometimes flowers solitary; pedicels up to 3·5 mm. long, very unequal in length in each fascicle, filamentose.
Calyx 1-2 mm. long, ± longer than the corolla, pale green or whitish; sepals oblong-lanceolate, attenuate-subulate to the apex which is acute or nearly so, very thin, stellate.
Seeds c. 0·5 x 0·22 mm., oblong, obtuse at base and apex, shallowly longitudinally ridged, the ridges straight, not shining.
Follicles ± 0·75 mm., obliquely obovoid, contracted into the very short styles, pale green, nearly translucent, 2-seeded.
Filaments ± attaining the middle of the corolla; anthers c. 0·15 mm., subcircular, yellow.
Annual, everywhere glabrous herb with slender root.
Scales minute, narrowly spathulate.
