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Leaves rigid, 2–5 x 0.25–0.8 cm., linear-oblong-lanceolate, acute at the apex, slightly narrowed at the base, sessile, with scabrid margins but otherwise glabrous; stipule base 2–3 mm. long with 5–6 setae 2.5–4 mm. long.
Herb 30–45 cm. tall with 3–6 ± 4-angled stiff unbranched or sparsely branched stems from a woody rootstock; stems scabrid with short seta-like hairs along the angles but otherwise glabrous.
Calyx tube 1 mm. long, turbinate, compressed, pubescent on upper half; lobes 4, erect, 1.2–5 x 0.5–1.5 mm., lanceolate, acute, scabnd-ciliate at the margins.
Corolla white; tube 3.5–4 mm. long, funnel-shaped, glabrous; lobes 4, 2–3 x 1.3–2 mm., triangular, ovate or ovate-oblong, sparsely pubescent outside.
Immature seeds dark brown, c. 3 mm. long, oblong; ventral furrow narrow, widened at both ends and there with packed raphides.
Flowers numerous in tight nodal clusters at terminal node and up to 9 subsequent nodes beneath it.
Fruit c. 3 mm. long, oblong, compressed, pubescent on upper half.
Style exserted, c. 5 mm. long; stigma shortly bifid.
Stamens exserted.
