Dielsia is a genus of plants in the Restionaceae described as a genus in 1904. There is only one known species, Dielsia stenostachya, endemic to Western Australia. species in homonymic genus In 1929, Kudô used the name Dielsia in reference to a plant in the Lamiaceae, thus creating an illegitimate homonym. He also created one species in his genus, i.e. \n* Dielsia oreophila (Diels) Kudô, syn of Isodon oreophilus (Diels) A.J.Paton & Ryding