Herbs, erect, annual, (2-)4-18(-22) dm, glabrous, bright green. Stems: caudex absent; aerial flowering stems erect, hollow and fistulose, 0.5-3.5(-5) dm, glabrous, minutely glandular proximally, infrequently also short-hispid. Leaves basal; petiole 1-6 cm, hirsute; blade round to reniform, (0.5-)1-2.5(-4) × (0.5-)1-2(-3) cm, short-hirsute on both surfaces and greenish, margins plane. Inflorescences cymose, open, spreading to erect, 30-150(-170) × 10-80 cm; branches usually fistulose, glabrous; bracts 3, scalelike, 1-4 × 1-2 mm. Peduncles mostly spreading, straight, slightly bent distally, capillary, 1-4 cm, glabrous. Involucres turbinate, 1-1.5(-1.8) × 0.6-0.9(-1.2) mm, glabrous; teeth 4, erect, 0.3-0.5 mm. Flowers 1.5-2.5 mm; perianth yellow with greenish to reddish midribs, densely hirsute with coarse curved hairs; tepals monomorphic, narrowly ovate; stamens exserted, 0.9-1.5 mm; filaments glabrous or sparsely pubescent proximally. Achenes light brown to brown, 3-gonous, 2-2.5 mm, glabrous. 2n = 32.
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