Stem with 25–90 ridges, well developed cortical air-spaces and numerous small sclerenchyma strands. Pith interrupted or rarely continuous. Cataphylls 3–13 cm long, lax, abaxially dull and ±dark yellow-brown distally, dark red-brown to blackish and dull at base. Lower bract usually longer than or equalling inflorescence. Tepals acute; outer tepals 1.7–2.1 mm long. Anthers 0.6–0.7 mm long; filaments c. 0.5 mm long; style c. 0.1 mm long; stigmas c. 0.5 mm long.