Perennial, 30-60 cm tall, stiffly erect, unbranched, scabrous, hispid, stem winged. Leaves 10-25 x 1-2 mm, linear, opposite at base of stem, alternate above, shorter than internodes, margin entire, veins obscure. Lower and upper bracts similar, 5(-12) x 1 mm, linear, shorter than calyx. Flowers alternate in open racemes, raceme much shorter than vegetative stem. Calyx 15-18-ribbed, 11-15 mm long; tube 7-9 mm long; lobes 5, equal, linear to lanceolate, 4-7 mm long, slightly shorter than tube. Corolla purple, tube 20-22 mm long, bent and expanded distally above calyx, densely pubescent; lobes of lower lip 8-11 x 4-5 mm, spreading, obovate, slightly notched; upper lip 5-8 x 8-11 mm, emarginate.
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Semiparasitic herb, up to 450 mm tall. Stems slender. Leaves linear, with long internodes. Calyx tube 10 mm long, ribbed. Flowers rosy purple.