Shrublet, up to 1 m high. Stems branched. Spikes at ends of branches. Leaves linear to linear-lanceolate, 0.5-2.0(-3.0) mm wide (length variable), usually entire. Flowers white, yellow or orange with orange, red or reddish brown in throat.
Leaves 10–45(70) x (0.5)1–3(5) mm., linear or less frequently linear-lanceolate, entire or occasionally faintly toothed, rarely distinctly so throughout length, glabrous, subfasciculate with smaller leaves in axils.
Corolla 8–12(15) mm. long, white with an orange to reddish-brown throat, tube 2.5–4 mm. long, limb to 8 mm. long, slender, glabrous; lobes 1–1.6 mm. long, oblong.
Stems erect, much branched; branches decurrent, densely leafy, minutely patent-or slightly retrorse-pubescent to subglabrous.
Inflorescence spicate with spikes (1.5)3–10(16) cm. long, not densely compacted-paniculate.
Bracts 2.5–4.5 mm. long, ovate, acuminate or apiculate, glabrous.
Calyx 3–5 mm. long, ovate, subobtuse, glabrous.
Capsule c. 4 mm. long, oblong in outline.
Perennial herb, 30–60(150) cm. tall.