Erect annual herb, not forming a rosette, unbranched or ± well branched throughout, 4-15 dm tall. Entire plant covered with soft hairs, densely to sparsely long-villous, the hairs erect, densely short villous, and densely glandular pubescent. Cauline leaves narrowly lanceolate, sessile, 5-15 x 0.5-1.5 cm; bracts narrowly lanceolate, sessile, longer than the capsules they subtend, (3-)4-9 x 0.5-1.2 cm; leaves plane or weakly to evidently undulate at the margins, sparsely serrate with blunt teeth. Inflorescence branched. Floral tube 8-11(-13) cm long. Sepals 2-3.5 cm long; sepal tips erect or divergent, 1.5-4 mm long. Petals yellow, broadly obovate, (1.5-)2-4 cm long. Style 9-13.5 cm long; the stigma held above the anthers at anthesis or surrounded by them. Capsules (2-)2.5-4(-5) x 0.3-0.4 cm, thicker in the upper third, 1.5-2 x 0.5-0.6 mm. Self-compatible; outcrossing or self-pollinating. Gametic chromosome number, n = 7 (7 bivalents, ring of 14 or intermediate configurations at meiotic metaphase I).