Lejeunea is a genus of leafy liverworts in the Lejeuneaceae family. The GBIF lists up to 592 species (as of October 2022), along with a worldwide distribution. World Flora Online lists up to 531 species (as of July 2023).
The genus was circumscribed by Marie-Anne Libert in Ann. Gen. Sci. Phys. vol.6 on page 372 in 1820.
The genus name of Lejeunea is in honour of Alexandre Louis Simon Lejeune (1779âÂÂ1858), who was a Belgian physician and botanist.