Herbs, perennial, erect, rhizomatous. Stems 30-50(-70) cm tall, with 4 scabrous angles. Leaf blade drying subleathery, linear-lanceolate, lanceolate, or narrowly oblong, 30-60 × 3-5(-12) mm, glabrous except antrorsely aculeolate along margins and veins abaxially, base acute, margins thinly revolute, apex acute or obtuse; vein 1, distinct, secondary veins not visible. Inflorescence corymbose, with scabrous axes, inconspicuously bracteate. Ovary ellipsoid, 1.5-2 mm, glabrous. Corolla funnel-shaped, 2.5-3 × 3.5-4 mm, lobed to ca. 1/2 length or slightly more; tube 1.2-1.5 mm; lobes elliptic-oblong, shortly acuminate. Fruit 3-4 mm in diam., vesicular, smooth to granulate; seeds ca. 1 × 1 mm. Fl. and fr. May-Jul.
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