The anatomy and development of mericarps in 4 representatives of Boraginaceae-Cynoglosseae were investigated. In each case the nutlets grow from a 6-layered carpel. While the mesocarp becomes multilayered and thick in correlation with epizoochory in Cynoglossum, it remains 6-layered in Mattiastrum, Paracaryum and Rindera. The wings are formed by both exo- and mesocarp and later on the inflated rim becomes hollow. Development of wing and reduction of glochids are discussed as adaptations to anemochory.