Allium mehmetyaschari Eker sp. nova (Amaryllidaceae) is described as a new species from the Province of Adana, southern Anatolia, Turkey. It is morphologically similar to A. sintenisii and A. erzincanicum in having bearded outer tepals. However, it clearly differs from A. sintenisii by having e.g., smaller bulb, stem and leaves; fewer bulblets; different sheath indumentum; different shape and size of umbel; shorter pedicels; smaller flowers and reproductive organs; different perigone colour; different indumentum structure on outer tepals; smooth inner tepals; and smaller capsule and seeds. It differs from A. erzincanicum mainly in tunic type; leaf structure; densely scabrid sheaths; umbel shape; indumentum shape on outer tepals; smooth inner tepals; ratio of central cup to lateral cups; anther colour; and in having bulblets. Herein, the morphological features, a comprehensive description, habitat and ecological characteristics, detailed images, conservation assessment and micromorphological characteristics of the seeds of A. mehmetyaschari are provided.