Annual herb, 60-200 mm, stem strongly flexuous, corymbosely branched above or rarely below. Leaves alternate, ascending, mostly 15-40(-60) x 8-20 mm, pinnatisect or some leaves bipinnatisect, with up to 8 lobes on each side, lobes alternate or subopposite and subsecund, filiform to linear, 3-10 x 0.5 mm, entire or with 1 or 2 lobules, rarely median lobe markedly prolonged, uppermost leaf simple and filiform. Capitula solitary, pedunculate; peduncles 15-60 mm long, with 2 or 3 minute, scale-like bracts. Involucre subglobose, 4-5 x 4-5(-10) mm, bracts 8-12, free, convex abaxially and canaliculate adaxially, leathery and three-veined in basal two-thirds, with membranous margins, penicillate. Ray florets as many as involucral bracts and opposite them, yellow; tube cylindrical, 1.5 mm long, with scattered abaxial trichomes; blade (5-)7-10(-15) x 1.5-3.0 mm, spreading, recurved apically; ovary ellipsoid, 1.5 mm long, antrorsely densely puberulous, style branches partly exserted, 0.5 mm long. Disc florets fertile, yellow, 4.5 mm long; tube funnel-shaped, ±2 mm long; lobes ±1 mm long, ovate, sparsely puberulous, acute; ovary ellipsoid, 1.5 mm long, antrorsely densely puberulous, style branches 0.5 mm long. Cypselas obovoid, ±1.5 mm long, densely antrorsely pubescent.
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Erect annual, with wiry, flexuose stems, 50-200 mm tall. Lower leaves pinnatisect with filiform segments, upper leaves filiform, 20-40 mm long. Flowerheads solitary at branch tips, radiate, 15-40 mm diam.; ray florets yellow; disc florets yellow; involucral bracts green, free. Cypselas densely hairy; pappus lacking.
Annual with wiry, flexuose stems, 5-20 cm. Lower leaves pinnatisect with filiform segments, upper leaves filiform. Flower heads radiate, yellow; ovaries hairy.
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