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Annual, erect herb, (15–) 20–35 (–45) cm high, simple or branched, laxly to densely foliated with sparsely glandular-pubescent, striate, ascending, reddish stems. Leaves sessile, ± thick, basally attenuate, coarsely sinuate-dentate on margins, obtuse; lower leaves oblong-oblanceolate, 6–7 cm long, 2–2.5 cm wide; upper leaves oblanceolate, 20–50 mm long, 5–20 mm wide. Capitula 6–8 cm diam., solitary; peduncle robust; involucre campanulate; bracts lanceolate, broadly scarious-margined, acuminate. Ray florets female, fertile; ligules 1.5–2.5 cm long, yellow or orange on both sides; style branches violet. Disc florets bisexual, yellow; lobe apices variable. Ray achenes obpyramidal-triangular, 4–5 mm long, ± rugose and tuberculate; disc achenes broadly obcordate-suborbiculate, 6–7 mm long, 5–7 mm wide, brownish, membranous.
Annuals, 5–30+ cm. Leaf blades narrowly oblong or oblanceolate to linear, 10–50(–100+) × 2–20(–30+) mm, margins usually sinuately denticulate, sometimes serrate or entire, rarely pinnati-fid. Peduncles (2–)5–15+ cm. Phyllaries 6–12+ mm. Ray corolla laminae abaxially yellow to orange (often marked with purple), adaxially mostly yellow to orange (sometimes purplish at bases and/or apices), 15–20(–30+) mm. Disc florets 15–50+; corollas yellow to orange, usually purplish distally, 4–5 mm (lobe apices acute, terete, or dilated). Ray cypselae 4–5 mm; disc cypselae 6–8 mm. 2n = 18.
Annual, like D. pluvialis but often less hairy, 100-300 mm tall. Leaves oblong or oblanceolate, sinuate-dentate, upper leaves subentire, sparsely hairy to glabrous. Flowerheads radiate, solitary, pedunculate; ray florets yellow to orange on both sides; disc florets yellow. Cypselas of ray florets obpyramidal triangular, wrinkled and tuberculate, of disc florets flat, winged, obcordate or suborbicular, 6-7 mm long.
Like D. pluvialis but often less hairy and flower heads with yellow or orange to beige rays.
