Herbs, erect, annual, (0.5-)1-6(-10) dm, glabrous, green. Stems: caudex absent; aerial flowering stems erect, usually hollow and fistulose, 0.5-2 dm, glabrous. Leaves basal or sheathing up stems 1-6 cm; petiole 1-10 cm, pilose-hispid; blade subcordate, (0.5-)1-4(-6) × (0.5-)1-5(-7) cm, pilose-hispid and bright green on both surfaces, margins plane. Inflorescences narrowly cymose, open, 5-80 × 5-35(-40) cm; branches often fistulose, glabrous; bracts 3, scalelike, 1-4 × 0.5-2 mm. Peduncles deflexed, straight, slender, (0.05-)0.1-0.25 cm, glabrous. Involucres turbinate, 1.2-1.6 × 1-1.4 mm, glabrous; teeth 5, erect, 0.4-0.6 mm. Flowers 1-2.5 mm; perianth greenish white to reddish, glabrous; tepals monomorphic, oblong; stamens included to exserted, 1-1.5 mm; filaments glabrous. Achenes dark greenish brown to black, 3-gonous, 1.4-1.7 mm, glabrous. 2n = 40.
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