Plants 100-300(-500) mm high. Corm conic, 10-30(-40) mm diam., tunics of fine-textured to coarse fibres, sometimes extending as collar. Stem erect, flattened and 2-winged, usually simple. Leaves 4 to 8, suberect or sometimes prostrate, half as long as to slightly longer than stem, narrowly lanceolate to oblong or falcate, (30-)50-150(-200) x 4-15(-25) mm, acute to attenuate, rarely obtuse-acuminate, margins plane or undulate to crisped, soft-textured or leathery with moderately thickened midrib. Spike deflexed, (3)4-to 10-flowered; bracts ovate, herbaceous and firm-textured, green, often flushed pinkish at tips, 5-10(-25) mm long, obtuse, inner slightly shorter. Flowers 20-40 mm long, yellowish green to olive-green or ± strongly flushed with brown or maroon, unscented or rose-scented at night; perianth tube subcylindric, expanding gradually from base to apex, 15-25 mm long, curved sharply downward in upper 5-7 mm with oblique mouth; tepals subequal with upper 3 slightly larger, recurved from base, lanceolate and obtuse to linear-lanceolate and attenuate, 6-15 x 1-2 mm. Filaments arcuate, 5-7 mm long, at bend in tube, included or very shortly exserted; anthers shortly protruding from tube, ± 3 mm long. Style dividing at base of anthers. Capsules oblong or subglobose, 3-lobed, 10-15 x 8-10 mm, rough or papillate when fresh. Seeds globose, 2.0-3.0 mm diam., wrinkled, glossy reddish brown.
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Cormous geophyte, 100-250 mm tall, with a flattened, winged stem. Leaves sword-shaped, margins often crisped. Flowers few, in an inclined spike, small, green or brownish, scented at night, perianth tube slender, tepals recurved.
Cormous geophyte, 10-35 cm, stem flattened and winged. Leaves sword-shaped to oblong, sometimes crisped and glaucous. Flowers small, green to maroon, tepals attenuate, tube slender and curved, clove-scented at night.
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