Description

Plants annuals or short-lived perennials; root crowns thickened with many fibrous roots. Stems branched or unbranched, 20–70 cm. Leaves 5–35 cm × 2–4 mm; blade cylindrical or slightly flattened adaxially, hollow, glabrous except on margins. Inflorescences simple racemes to open panicles with ascending branches, 15–70 cm; bracts white, 4–7 mm. Flowers diurnal, closing in evening and during cloudy weather; tepals white to pale pink, oblong, obtuse, 5–12 × 2–3 mm, vein dark pink or brown; longest stamens equaling style. Capsules 5–7 mm, transversely wrinkled. Seeds 3–4 mm, rugose. 2n = 28, 56.