Diffusely branched, sprawling, wiry-stemmed annual, mostly 100-150 mm tall. Leaves usually in whorls of 6, linear, sometimes elliptic, bristle-tipped, stipules filiform, membranous. Flowers in small axillary clusters, white. Fruit obliquely top-shaped, minutely pitted.
Diffusely branched, sprawling, wiry-stemmed annual, mostly 10-15 cm. Leaves whorled, linear, sometimes elliptic, mucronate. Flowers in small, axillary clusters, white. Fruits obliquely top-shaped, minutely pitted.