Annuals 10-40 cm tall. Stems erect; branches spreading, angled, pubescent along angles. Basal leaves withered at anthesis. Stem leaves widely spaced; leaf blade ovate-lanceolate to triangular, 1-2.6 cm × 8-11 mm, much shorter than internodes, abaxially weakly pubescent on veins, base rounded, margin ciliolate, apex acute; veins 3-5, prominent. Flowers terminal, solitary, sessile. Calyx tube campanulate, 1-1.3 cm, membranous, broadly winged, pubescent along wings; lobes linear-lanceolate, 8-10 mm, margin ciliolate, apex acuminate, midvein outside strongly keeled and decurrent into wings of calyx tube. Corolla pale yellow to yellow, tubular to funnelform, 3-4.5 cm, tube puberulent along veins; lobes ovate, 5-8 mm, margin entire, apex slightly acuminate to subacute; plicae horizontally truncate, margin erose. Stamens inserted at basal part of corolla tube, unequal; filaments 0.7-1.8 cm; anthers narrowly ellipsoid, 2.5-3 mm. Style 1-1.3 cm; stigma lobes linear. Capsules ellipsoid, 2.5-3 cm; gynophore to 5 mm. Seeds dark brown, ellipsoid, 2-2.5 mm. Fl. and fr. Sep-Dec.
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