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Leaves in whorls of (5)6–10,1-nerved, (10)15–30(40) x 0.5–1.5(2.5) mm., linear to linear-oblanceolate, often apparently terete due to strongly recurved margins, with a distinct, filiform brownish acumen at apex; upper and lower surface with short, ± spreading hairs, glabrous or with minute, forwardly directed prickles above.
Inflorescence broadly pyramidal to ± narrowly cylindrical, cymes many-flowered and dense to rather few-flowered and lax, ultimate branches with (0)1–4 minute bracts; pedicels 1–3(6) mm. long, ± filiform, glabrous, strongly divaricate in fruit.
Stems erect or semi-erect, (15)25–60(70) cm. long, with usually few ± short lateral branches, the 4 distinct, often whitish angles with short ± spreading hairs or glabrous; nodes usually hairy to densely hairy.
Corolla 2–3(4) mm. in diam., rotate, glabrous, yellow, pale yellow or greenish-yellow; lobes longer than wide, ± acuminate; stamens ± half as long as lobes; ovary c. 0.4–0.8 mm. long.
Fruit glabrous, ± granulated; mericarps subglobose, each 1.5–2 mm. in diam.
Perennial with a somewhat woody rootstock.
