Annual or perennial herb, or sometimes a herbaceous subshrub, up to 60 cm in height. Branches are thin and long, glabrous to scabri-pubescent, ascending from a woody base and almost parallel. Leaves are linear-lanceolate, acute, glabrescent to densely scabridulous-pubescent, 5-80 mm long and 2-3 mm wide. Inflorescence is lax, di- to trichotomous, composed of flowers at the nodes or terminating the branches. Flowers are solitary, sessile or apparently pedicellate, pale creamy to livid. Calyx is very small, forming an ovoid tube about 1 mm long, with lobes 0.5-2 mm long. Corolla forms a narrow, trumpet-shaped tube up to 15 mm long, with a limb bearing linear lobes. Fruits are ovoid to subglobose capsules, 3.5 × 3 mm, with very small (<1 mm) wart-like outgrowths.