Solitary, tufted herb up to 1 m tall; tufts less than 10 mm wide at base, stems up to 80 cm long.
Leaves 11-30 cm long, lamina 16-20 x 1.3-2 cm, flat, attenuate; petioles about 6-7 cm long, winged and V-shaped in transverse section. Leaves arranged in a single plane like a fan. Venation parallel with 4-5 main veins on each side of the midrib. Small serrations on lamina margin and on the midrib below, lamina 2-3 cm wide. Sheaths conduplicate and slightly occluded distally, resembling a petiole, length of the lamina.
Inflorescence exceeding foliage, narrowly cylindrical in outline; cymules condensed, 4-15 -flowered; pedicels 1.5-10 mm long and angular in T.S. Perianth segments elliptic. Sepals 4.5-5.5 mm long and 5-nerved, purple. Petals 3.7-5.2 mm long and 3-nerved, pale blue to white. Filament swelling 0.8-1 mm long, brown. Ovules 4 per locule.