Annual herb. Stems up to 1 m high, branched, often with long straight and short curly hairs. Basal and lower cauline lvs to c. 20 × 3 cm, linear-lanceolate to linear-oblong, hispid with hairs pulvinate at base; base attenuate; apex ± obtuse and mucronate; upper lvs similar but smaller. Infl. with basal bracts; pedicels very short. Calyx (1)-2-4-(4.5) mm long at flowering, to 5 mm long at fruiting; lobes linear-lanceolate, hispid. Corolla 4-8 mm long, yellow; tube ampliate, glabrous within; limb 2-3 mm diam., suborbicular. Nutlets c. 2.5 mm long, with longitudinal muricate ridges and transversely rugose furrows.