Rhipsalideae

The tribe Rhipsalideae was established by Augustin Pyramus de Candolle in 1828.[1] De Candolle included only one genus, Rhipsalis.[4] Cacti belonging to the Rhipsalideae are quite distinct in appearance and habit from other cacti, growing on trees or rocks as epiphytes or lithophytes, and are thus easily distinguished. However, for many years there has been confusion as to how to divide the tribe into genera.[5] For example, in 1858 Charles Lemaire recognized the distinctiveness of the species then called Epiphyllum russellianum by creating the genus Schlumbergera. However he kept the only other species of Schlumbergera known at the time in a different genus.[6] As another example, in 1923, Nathaniel Britton and Joseph Rose created the genus Hatiora. Of the species known at the time, they placed two in Hatiora (H. salicornioides and H. cylindrica). They placed one species in a new genus, Rhipsalidopsis, as R. rosea, but left a related species in Schlumbergera as S. gaertneri, where they had placed it in 1913.[7] According to Anderson,[5] the confusion among the Rhipsalideae was not clarified until work by Wilhelm Barthlott and Nigel Taylor in 1995.[8]

Molecular phylogenetic studies led to a slight modification of the approach taken by Barthlott and Taylor, since with their circumscriptions, Hatiora and Schlumbergera were not monophyletic. One hypothesis for the relationships between the genera is shown below. The yellow shading shows species formerly placed in Hatiora, but which were placed by Calvente et al. in 2011 in a more broadly defined Schlumbergera,[9] and are placed in the genus Rhipsalidopsis by other sources.[10][11][12]

• Anderson, Edward F. (2001), The Cactus Family, Pentland, Oregon: Timber Press, ISBN 978-0-88192-498-5

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