Annuals 12-15 cm tall. Stems erect, striate, branched from base. Leaves sessile, lanceolate to elliptic, 0.9-1.2 cm × 2-4 mm, base and apex attenuate, veins indistinct. Cymes axillary and terminal, sometimes secund, few flowered. Flower usually nodding, 4merous. Pedicel to 2 cm, filiform, striate. Calyx 3.5-5 mm; lobes spreading, narrowly elliptic to elliptic-spatulate, base slightly contracted, margin scabrous, apex obtuse, veins indistinct. Corolla blue, tubular, 9-10 × 3-3.5 mm; lobes broadly elliptic, 2.5-3 mm, apex obtuse to rounded. Nectaries 8, oblong. Stamens inserted at middle of corolla tube; filaments pale blue, flattened, 2.5-3 mm, decurrent basally into narrow wings of corolla tube; anthers yellow, ellipsoid, ca. 0.7 mm. Ovary sessile, ovoid-ellipsoid, ca. 5.5 mm. Style indistinct; stigma lobes suborbicular. Fl. Aug-Sep.
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