Tufted, perennial, evergreen herb, 0.6-1.1 m high, rhizomatous; stem rounded, usually branched. Leaves linear to ensiform, 6-20 mm wide. Spathe ovate, with transparent margins; adaxial surface minutely hairy. Bracts broadly ovate, rusty brown, entire, may become irregularly thorny with age. Inflorescence rhipidial, spreading, with blue flowers; tepals 14-20 mm long; style minutely 3-notched; flowering stem flexuose, open branching. Flowering time Oct.-Apr. Capsule elongate, somewhat truncate at apex, may become irregularly torn with age; 3 or 4 lamellate seeds per locule.
Rhizomatous perennial to 1 m, stems rounded, usually much branched. Leaves linear-sword-shaped, broad, fibrotic. Flowers blue, style undivided, spathes ovate, usually dry-rusty with transparent margins, sparsely short hairy below. Capsules oblong, 3-winged.