Herbs annual, 6-35(-60) cm tall. Roots slender, woody. Stems prostrate or erect, branched or unbranched near base, mostly glandular pubescent, sometimes glabrescent. Leaf blade lanceolate, elliptic, or oblong, 3-10 × 0.5-3 cm, base decurrent, margin entire or dentate, sometimes pinnatifid or pinnatisect, with 2-4 pairs of deltate lobes, apex obtuse or acuminate. Flowers solitary, axillary, subsessile or on pedicels 3-5 mm. Calyx tubular-funnelform, 0.8-1.3 cm; lobes deltate, needlelike. Corolla yellow with a dark purple throat, funnelform, slightly longer than calyx. Stamens included. Fruiting calyx inflated, tubular-funnel form, 2-2.5 cm; lobes spreading. Capsules cylindric, ca. 7 mm. Seeds compressed reniform, ca. 1 mm. Fl. Apr-Jun, fr. Jun-Aug.
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