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Stems slender 30–65 cm. tall, usually several simple stems from a woody base, sometimes branched above, shortly pubescent.
Leaves opposite below, alternate above, 15–38 x c. 2 mm., linear, held vertically, shortly scabrid pubescent.
Calyx tubular, strongly 15-ribbed; tube 8–11 mm. long; teeth 5,3–8 mm. long, linear.
Flowers 4–14, alternate, shortly pedicellate in loose terminal inflorescences.
Capsule 8 x 2.5 mm., valves recurved at apex after dehiscence.
Bracts and bracteoles subulate, usually shorter than calyx.
Erect perennial herb with mauve tuberous roots.
