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Description:
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 4–8, suberect or sometimes prostrate, half as long as to slightly longer than stem, narrowly lanceolate to oblong or falcate, (30–)50–150(–200) × 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)4–10-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 × 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 × 8–10 mm, rough or papillate when fresh. Seeds globose, 2.0–3.0 mm diam., wrinkled, glossy reddish brown. Flowering time: mid May–mid Aug.(Oct.).
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