Annual herb, up to 900 mm high; stems simple or branched near base, ridged, leaf bases decurrent. Leaves sessile or base half-clasping stem; up to 400 x 3 mm, linear, acute, ± entire, some distantly denticulate. Flowers in bracteate racemes, grouped in lax corymbs; indumentum of minute, ± sessile hairs, dot-like (also on bracts, pedicels and calyces); pedicels ± 4 mm long. Bracts lanceolate. Calyx: lobes linear to ovate. Corolla white, sometimes mauve-tinged. Spur conical prolonged, up to 4 mm long, obtuse. Flowering time Sept.-Jan. Fruit an oblong capsule, 10 x 7 mm, hardly narrowed near apex, base and upper margin of valves ± rounded.