Annuals 5-20 cm tall. Stems erect, striate, branched from base. Leaves sessile, linear, 6-12 × 1-1.5 mm, base and apex obtuse, margin scabrous, veins indistinct. Cymes axillary and terminal, few flowered. Pedicel to 4 mm. Flowers 5merous. Calyx 7-8 mm; lobes linear, 4-5.5 mm, slightly unequal, sinus between lobes subrounded, margin scabrous, apex obtuse, veins indistinct. Corolla blue, with pale yellow toward base, tubular, 1.2-1.4 cm; lobes oblong, 2.5-3.5 mm, apex obtuse. Nectaries 10. Stamens inserted at middle of corolla tube; filaments white, 4-5 mm; anthers yellow, ellipsoid, ca. 1.2 mm. Style indistinct; stigma lobes suborbicular. Capsules ovoid-ellipsoid, ca. 7 mm; gynophore ca. 2 mm, stout. Fl. Aug.
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