Bulbs rhizomatous, unbranched, continuously scaly, 1.5–4.7 × 3.5–11 cm, 0.2–0.6 times taller than long; scales (1–)2(–4)-segmented, longest 0.9–3.7 cm; stem roots absent. Stems to 1.9 m. Buds rounded in cross section. Leaves occasionally scattered in young plants or in 1–5 whorls or partial whorls, 3–18 leaves per whorl, ± horizontal and drooping at tips or ascending, 7.8–29 × 0.5–4.9 cm, 2.6–29 times longer than wide; blade elliptic to narrowly linear, or ± obovate, often lanceolate in distal leaves, margins not undulate, apex acute, often narrowly so; veins and margins ± smooth abaxially. Inflorescences racemose, 1–31-flowered. Flowers opening before dusk, horizontal or somewhat nodding, slightly bilaterally symmetric, strongly fragrant; perianth funnelform; sepals and petals recurved 3/5 along length from base, lower less recurved than upper and forming landing platform, bright yellow with sparse, usually minute maroon spots, not distinctly clawed; sepals not ridged abaxially, oblanceolate, 7.7–10.7 × 1.1–1.7 cm; petals noticeably wider than sepals, often very wide distally, 7.8–10.6 × 1.1–2.1 cm, apex widely acute or sometimes obtuse; stamens barely exserted; filaments barely spreading, diverging at 5°–12°; anthers pale magenta-brown, 0.8–1.4 cm; pollen rust-orange or orange-brown; pistil 5.3–9.3 cm; ovary 1.6–2.9 cm; style green, often pale; pedicel 2–17.5 cm. Capsules 3.9–5.9 × 1.1–1.7 cm, 2.5–4.4 times longer than wide. Seeds 141–303. 2n = 24.
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