Leaves 9–40 cm × 2–10 mm. Scape 10–30 cm, smooth except weakly scabrous near base. Flowers: perianth bright yellow or pale blue, 12–19 mm, tube attenuate at base, 5–10 mm, lobes widely spreading, striped greenish, 5–11 mm; stamens attached alternately at 2 levels, unequal, those of proximal row very short; filaments linear or barely wider at base, 1 or 3 mm, apical appendages absent; anthers yellow or blue, 1–2 mm; ovary green, equal to or longer than stipe; pedicel 0.7–2 cm, usually shorter than perianth. 2n = 16.
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