A prickly matter: nomenclatural synopsis of <i>Onosma</i> L. and its segregates (Boraginaceae)

A complete nomenclatural synopsis is provided for Onosma (Boraginaceae) and the allied genera Maharanga Podonosma, covering each name of new taxa, combination replacement communicated since 1753 till October 2021. All 749 validly published names are listed together with an account formal reasons why 136 additional must be regarded as invalid. Type species indicated or newly designated all infrageneric names. Information assembled on types 466 specific infraspecific taxa retrieved from a comprehensive survey scientific literature public databases, 126 (27%) lectotypified here. Finally, 42 combinations proposed to solve yet unresolved issues.