Annual, simple or branched, up to 50 cm, glabrous throughout. Leaves membranous, narrowly oblong or oblong-lanceolate, or obovate-oblong, 1.75-3½ cm by 4-8 mm; base acute to obtuse; apex acuminate and minutely apiculate; nerves obscure, 4-6 pairs; petiole short, c. 1 mm. Involucral bracts 4, united at the lower third or lower half into an obconical cup, 7-15 mm long, the free parts ovate or deltoid, rarely obovate, 4-10 by 6-8 mm, acute or acuminate, imbricate, the outer pair overlapping the inner pair and usually longer than wide rarely wider than long. Inflorescences terminal, usually more than 50-flowered; peduncles variable in length, very short or up to 4.5(-7) cm; pedicels flat, usually dilated at the base, very short to 1.5 mm, articulated at the top. Flowers 10-15 mm long, inserted on the cup-shaped part of the involucre, centripetally developing, white to rose. Floral tube cylindric. Calyx lobes 4, imbricate, oblong or slightly obovate-oblong, 2-2.5 mm long. Disk scale-like, small, c. 0.5 mm long. Stamens 2.5-3.5 mm. Ovary ovoid, 1-1½ mm long; style exserted; stigma sub-capitate. Fruits ovoid, 2-4 by 1 mm, short-stalked.
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Herb 0.2–0.8 m high. Leaves narrowly ovate to narrowly obovate; lamina 9–44 mm long, 2–6.5 mm wide. Inflorescence: receptacle 3.5–6 mm long at first, to 8.5 mm long in fruit; involucral bracts broadly ovate to depressed ovate, 3–6 mm long, 4–15 mm wide, green; peduncle 1–10.5 cm or rarely 0.5–1 cm long. Flowers white or pink; pedicel to 1.5 mm long. Hypanthium 9–12 mm long, glabrous. Sepals spreading, 2.5–3.5 mm long. Stamens shortly to greatly exceeding sepals; anthers 0.8–1.4 mm long, pink to purple.
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