Abstract
A new species, Onosma bakhtiarica (Boraginaceae), has been discovered in Iran’s Chaharmahal and Bakhtiari province. The plant is found in the Tang-e Beheshtabad and belongs to sect. Onosma subsect. Haplotricha. Morphologically, it is closely related to O. pachypoda and O. sericea. Still, it differs from the mentioned species by the rosette leaf shape, shape of rosette leaf apex, shorter cauline leaf, cauline leaf width and shape, arrangement of setae, corolla color and shape, shorter pedicel length in flowering and fruiting, shorter fruiting calyx, bract shape, nutlet shape and size, nutlet ornamentation, and a hairy annulus. In addition, O. bakhtiarica is distinguished from O. pachypoda by its light brown nutlet, rosette leaf with a long petiole, and cauline leaf with an acute apex. It can also be distinguished from O. sericea by the dense short hairs covering the corolla’s exterior. Diagnostic characters, a comprehensive description, photographs, and a distribution map are provided. An identification key for haplotrichous Onosma species of Iran is also provided.
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