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Herbs, annual, to 50(-100) cm tall. Root fibrous. Stems many from base, spreading or erect, often purplish tinged, sparsely white pubescent. Leaves opposite; stipules triangular, to 1.5 mm, laciniate; petiole to 3 mm; leaf blade ovate, to 3(-7) × 1.5(-2.5) cm, adaxially almost glabrous, abaxially glaucous, base obliquely rounded, margin obscurely toothed, apex rounded. Cyathia in axillary or terminal pedunculate capitate cymes, peduncle to 30 mm; involucre cuplike, ca. 1 × 1 mm, pubescent, marginal lobes triangular, apex acute; glands 4, green, rounded, appendages white, to 1 mm in diam., often smaller. Male flowers slightly exserted. Female flower exserted from involucre; ovary pubescent; styles free; stigma deeply 2-lobed. Capsule 3-angular-ovoid, ca. 1.5 × 2 mm, smooth, pubescent; fruiting pedicel ca. 1.5 mm. Seeds ovoid-tetragonal, ca. 1 × 0.75 mm, reddish brown, sides obscurely transversely furrowed; caruncle absent.
Annual herb, up to 0.6 m high. Stems erect-spreading, simple or branched. Leaves opposite; shortly petiolate; blade oblong to narrowly ovate-oblong, elliptic or ovate, 6-40 x 4-20 mm, apex acute to rounded, base oblique, margins minutely toothed, puberulous on lower or both surfaces; stipules fimbriate. Flowers: in axillary, pedunculate cymes or subglobose heads; bracts narrowly ovate, apex acuminate; involucres cup-shaped with 4 appendaged glands and 5 lobes; Dec.-Mar.
Leaves with a petiole to 3 mm long; stipules to 1.5 mm long, broadly triangular, laciniate; lamina to 3 × 1.5 cm, ovate, apex rounded, base obliquely rounded, margin obscurely toothed, upper surface often glabrous, rarely both surfaces glabrous.
Erect or prostrate herb. Stems with conspicuous spreading yellow hairs on their upper part. Leaves ovate to elliptic, margins serrate, base oblique. Involucres in dense subglobose heads. Flowers reddish green.
Cymes terminal and axillary, capitate to 1.5 cm in diameter on peduncles to 3 cm long, subtended by a pair of small leaf-like bracts, the whole shortly pilose to glabrous; cyathial peduncles to 2 mm long.
Annual herb, spreading or erect, with branches to 50(100) cm long, the whole plant, including the capsule at least when young, sparsely pilose, rarely almost glabrous, often purplish tinged.
Cyathia c. 1 × 1 mm with cup-shaped involucres; glands 4, minute, rounded, green, with appendages varying in size to 1 mm in diameter, white; lobes 0.5 mm long, acutely triangular.
Female flower: ovary pilose or with at least a few short hairs, rarely entirely glabrous; styles 0.5 mm long, suberect, bifid almost to the base.
Seeds 1 × 0.75 mm, oblong-conical, with obscure transverse ridges, reddish-brown.
Capsule exserted on a reflexed pedicel 1.5 mm long, 1.5 × 2 mm, acutely 3-lobed.
Male flowers: bracteoles linear; stamens 1.25 mm long.
Bracts to 2.5 mm long, linear.
