Annuals 10-30 cm tall. Stems usually dark purple, erect, simple or apically branched. Basal leaves short petiolate; leaf blade spatulate to obovate-spatulate, 0.7-1.5 cm × 3-8 mm, base narrowed, apex obtuse to rounded. Stem leaves sessile, oblong, 1.2-4 × 0.3-1 cm, base rounded and subamplexicaul, apex obtuse, midvein distinct. Pedicel erect, to 5 cm, subquadrangular. Calyx 2-2.5 × ca. 1.2 cm; lobes subequal, 6-7 mm, with strong keeled ridges outside; outer lobes triangular-lanceolate to triangular, ca. 5 mm wide, apex acute; inner lobes ovate-triangular, to 7 mm wide, apex obtuse. Corolla pale yellow, broadly tubular, 3-4 × ca. 1 cm; lobes oblong, ca. 1 cm, margin not fringed, apex rounded and denticulate. Nectaries oblong. Filaments flattened, to 1.5 cm; anthers ellipsoid, ca. 3 mm. Style short. Capsules narrowly ellipsoid, as long as corolla; gynophore present. Seeds ellipsoid, ca. 0.5 mm. Fl. and fr. Sep-Oct.
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