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Iochroma orozcoaeA.Orejuela & S.D.Sm.,sp. nov.(Solanaceae) is described from the Andean forests of Cundinamarca in the eastern cordillera of Colombia.Iochroma orozcoaewas first collected by the eminent Spanish priest and botanist José Celestino Mutis in the late part of the 18^thcentury, but the specimens have lain unrecognised in herbaria for over 200 years. The species shares many features with its closest relative,Iochroma baumiiS.D.Sm. & S.Leiva, but it differs from it in having small flowers with five corolla lobes and few inflorescences per branch, located near the shoot apex with 1 to 4 (–8) flowers, fruits that are greenish-yellow when ripe and its restricted geographic distribution. A description ofI. orozcoaeis provided, along with a detailed illustration, photographs of live plants, a comparison with closely-related species and a key to all Colombian species ofIochromaBenth. In closing, we emphasise the value of historical collections for the knowledge of biodiversity.