Aeonium decorum var. alucense and Aichryson laxum var. latipetalum, from eastern La Gomera and southern Tenerife, respectively, are described as varieties new to science and illustrated. New combinations in Aeonium (A. arboreum subsp. holochrysum, A. canariense subsp. christii, A. canariense subsp. latifolium, A. canariense subsp. virgineum, A. lindleyi subsp. viscatum), Aichryson (A. tortuosum var. bethencourtianum) and Monanthes (M. minima subsp. adenoscepes) are validated. M. polyphylla subsp. amydros, thought to be endemic to La Gomera, is also reported for the island of La Palma. Additional descriptive data for M. wildpretii are provided. Special attention is paid to the morphological characteristics that differentiate some closely related taxa.