Perennial wetland herb. Rootstock bulbous, fibre-covered, bearing smaller bulbils. Leaves semi-terete, channelled above, tapered distally, to 30 cm long, to 3 mm diam.; basal sheath terminating in a 2-lobed ligule. Scape at fruiting terete, to 20 cm long. Infructescence an erect raceme, c. 10–13 cm long, with 27–35 fruits; pedicels slender, spreading, 3–8 mm long. Fruit narrowly ellipsoid-cylindric, attenuate distally with short stylar beaks outcurved at apex, c. 8–10 mm long, 1.5–2 mm diam. Carpels 6, fully united ventrally, 3 fertile alternating with 3 sterile, erect to spreading; fertile carpels smooth, lacking projections; sterile carpels forming a slender, 3-winged central axis.
Perennial herb, helophyte, 0.1-0.6 m high; rhizome stoloniferous or cormous, usually with cormlets. Leaves basal, usually distichous, ± terete, glaucous, with semi-amplexicaul sheaths. Scape erect, firm. Inflorescence an erect raceme; pedicels patent; flowers green; perianth segments with purplish apex; outer boat-shaped, acute; inner obtuse. Ovary: 3 vestigial outer carpels and 3 inner carpels lengthening at anthesis and after fertilization; stigmas 3, purple, papillose. Flowering time Sept.-June. Follicles elongate, with 3 fertile carpels and no sterile ones.
Tufted, bulbous perennial, 50-500 mm tall, with brown to dark brown fibrous tunics at base. Leaves green at flowering, narrowly cylindrical to filiform, ± as long as inflorescence. Flowers 4-50, in a dense or lax spike, green. Fruit narrowly ovoid, 4-10 mm long, without basal outgrowths.
Tufted perennial with fusiform bulbs, 5-50 cm, with dark fibres. Leaves green at flowering, terete to filiform. Flowers 4-40 in lax or dense racemes, green. Fruits narrowly ovoid, 4-12 mm long.