Annual or biennial herb, 0.4-0.7 m high; base simple or branched. Leaves often in basal rosette, up to 45 x 25 mm, ovate or ovate-elliptic; cauline leaves smaller, further apart. Flowers in many-flowered cymes, bracteate. Calyx: segments 5, lanceolate to oblanceolate-oblong, sides hyaline or opaque, keeled or with narrow keel wing. Corolla yellow; tube 3.25-5.00 mm long, clawed. Stamens inserted in corolla sinuses; anthers with or without 3 minute stipitate glands. Style with or without small swelling at or below middle; stigma capitate, 2-lobed. Fruit a capsule.
Tufted annual or biennial to 70 cm. Leaves in a basal rosette, ovate. Flowers 5-lobed, yellow, calyx lobes keeled, stamens inserted in sinuses, style swelling absent or below middle.