Slender, about a span high. Stem erect or flexuous, simple, more or less terete, glandular-puberulous, leafy. Leaves all sessile; leaflets 3, more or less equal in length, linear or cuneate-oblong, glandular-puberulous, glabrous above, 0.3-0.5 mm long. Peduncles axillary, erecto-patent, filiform, glandular-puberulous, when in flower 1.5-2 cm long, lengthening after flowering up to 4.5 cm long. Bracteoles none. Sepals linear-lanceolate, acute, 2-3 mm long, densely glandular-puberulous. Corolla ‘deeply’ (alte) funnel-shaped, 1.5-1.6 cm long; tube slightly swollen towards the apex, like that of O. purpurata, completely glabrous; petals rotundate, narrowed towards the base, glabrous. Styles hispid at the base, completely glabrous above the middle. Ovary strigose; capsule rotundate, scarcely longer than the calyx. Seed oblong.
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Like O. viscosa but pedicels slender and ebracteate and flowers purplish.