Taprooted annual. Stems 1-several, erect, glabrous, (15)-20-45 cm tall. Lvs glabrous or sparsely scabrid-ciliate on margin, green, linear to narrowly lanceolate, acuminate, sessile, shortly connate in pairs, (20)-40-100 × (1)-2-5-(10) mm. Infl. a lax (1)-3-7-(15)-flowered irregular dichasium; pedicels (2.5)-4-6-(10) cm long; bracts leaflike. Fls ☿. Calyx glabrous, broadest in middle, contracted at mouth, veined on 10 thickened ridges, (15)-20-28 mm long; teeth linear-acuminate, erecto-patent. Petals pink or white to bluish (bluish when dry); limb shallowly emarginate; claw not lobed; coronal scales acute, dark, c. 2 mm long. Styles 5, erect, curved at apex, c. 10 mm long. Capsule narrow-ovoid, included in calyx, 15-20 mm long; teeth 5, 2-fid; carpophore 6-8 mm long. Seeds dark grey-brown, reniform, warty, 0.8 mm long.