Kageneckia
- Kageneckia angustifolia D. Don
- Kageneckia crataegifolia Lindl.
- Kageneckia crataegoides D. Don
- Kageneckia oblonga Ruiz & Pav.
- Kageneckia ovata Colla
Keulia
Kieslingia
Knowltonia
- Knowltonia hepaticifolia (Hook.) Christenh. & Byng
- Knowltonia hootae Christenh. & Byng
- Knowltonia moorei (Espinosa) Christenh. & Byng