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Annual herb, 30–65(75) cm. tall, erect; stem slender, simple but occasionally branched within inflorescence, glabrous except for few patent hairs towards base.
Bracts 3.5–5 x 3–4 mm., broadly subreniform with a short broad apical mucro, shortly pubescent, hispid-ciliate, not keeled.
Calyx (2.5)3.5–4 mm. long, 4-lobed, 4-nerved; lobes lanceolate 1.5–2 mm. long, ciliate, erect, sinus c. 2–2.5 mm, deep.
Spikes 8–25(35) mm. long, to 6.5 mm. wide, subquadrangular, compact, not becoming lax in fruit.
Leaves 4–24 x 0.2–1(1.5) mm., 1-nerved, subappressed to stem, linear, scabrid, hispid-ciliate.
Capsule 2.8–3 x 1.6–1.8 mm., broadly ovoid, slighdy emarginate; beak to c. 0.4 mm. long.
Bracteoles 2.5–3.5 x 0.5–0.8 mm., linear-lanceolate, acute, hispid-ciliate.
