Herbs, annual, procumbent to erect, dark green, 2-7 dm. Stems ascending or erect, light brownish green, 1-several-branched mainly in distal part of plant, becoming woody at base; branches ascending or erect. Leaves ascending; blade linear, 17-30 × 0.7-1.5 mm, widest proximal to middle, apex acute. Glomes on main stem and lateral branches, not crowded into compound spikes, 1-3-flowered; bracts shorter than leaves, 4-12 mm. Flowers bisexual; perianth ± zygomorphic or irregular (segments slightly unequal), 2-4 mm diam.; perianth segments abaxially rounded and keeled, distally hooded, apex acute; stigmas 2-3. Seeds dimorphic; lenticular, 1.5-2.3 mm diam., with seed coat black to reddish, finely reticulate; or flat, 1.5-2.3 mm diam., with seed coat brown, dull. 2n = 90.
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