Índice: Species (currently accepted name)
- Kadenia dubia (Schkuhr) Lavrova & V.N.Tikhom. (2)
- Kernera saxatilis subsp. boissieri (Reut.) Nyman (5)
- Kickxia elatine (L.) Dumort. (2)
- Kickxia spuria (L.) Dumort. (1)
- Klasea lycopifolia (Vill.) Á.Löve & D.Löve (43)
- Koeleria glauca (Spreng.) DC. (1)
- Koenigia ocreata (L.) T.M.Schust. & Reveal (1)
- Kosteletzkya pentacarpos (L.) Ledeb. (3)