Dwarf, stemless, about 3 cm high. Bulb (mature) ovoid, acute at the apex, 5.5 cm long, 3.5 cm diam., with dark brown gummy tunics. Rhizome very slender, often 10 cm long, with a few small semiamplexicaul scales, those at the apex larger. Leaves 6-10; petioles, like the peduncles, rather coarsely cano-pubescent, often 1-2 cm long; leaflets 3, subsessile, rather fleshy, conspicuously impresso-punctate on both faces when dry, glabrous or pilose above, more or less pilose beneath, sometimes callose on the anterior margin, the medial rotund above, more or less cuneate-attenuate towards the base, 5-7 mm long, 4-6 mm broad, the lateral oblique, rather smaller and narrower, often slightly retuse on the inner margin. Peduncles 0.5-2 cm, long, with 2 callus-tipped alternate bracts above the middle. Sepals ovate-oblong, about 4 mm long, pubescent, ciliate, straw-coloured, sometimes purple-striate on the margins, with 2 or more calli at the apex. Corolla 2.2-2.4 cm long, yellow, with a cylindrico-funnel-shaped tube; laminae of the petals cuneate-obovate subtruncate, about 9 mm broad, slightly longer than the narrow claw. Filaments, the shorter 6-9 mm, the longer 10.5-14 mm long, very minutely glandular-pilose, edentate. Ovary densely pubescent, the chambers about 7-ovuled, ecallose; styles viscous, the longest 14 mm long, well exserted from the corolla tube. Seeds endospermous.
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Like O. pulchella but leaflets glabrous or pilose above, ± pilose beneath, sometimes callose on margin, alternate bracts above middle, longest styles and stamens 14 mm (vs < 10 mm) long, flowers yellow, and corolla tube ± cylindrical (vs. funnel-shaped).