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A herb. It grows 70 m tall. The leaves are 5-50 mm long by 0.5-4 mm wide. They are alternate and narrowly sword shaped. There are 5-50 flowers in a group at the ends of the branches. The flowers are small and greenish-white.
Annual or perennial herb up to 70 cm. tall, glabrous, sometimes rough, never glandular-pubescent, sometimes a subshrub with several ± erect or trailing herbaceous shoots and woody base; stems not much branched.
Leaves 5–50 × 0·5–4 mm., alternate, subopposite or fasciculate, narrowly linear to lanceolate, entire, with prominent midrib below; petiole short, with swollen base.
Mericarps sometimes bigger than perianth-segments, with 2 usually large smooth auricles at base, the outer face alveolate-tuberculate to spinescent.
Perianth-segments 5, 2–3 mm. long, slightly unequal, membranous, whitish but with greenish keel, broadly ovate, obtuse, mucronate.
Flowers small, greenish-white; pedicels up to 2 mm. long; bracteoles membranous, whitish, lanceolate.
Inflorescences terminal and lateral, 5–50-flowered, pedunculate, umbelliform, laxly branched.
Staminodes 0(-5), when present very small and caducous.
Stamens 7 with filaments enlarged and fimbriate below.
Ovary 2-lobed, glabrous.
