PROFILPELAJAR.COM

Rhipsalideae
	Rhipsalis cereuscula
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Cactaceae
Subfamily:	Cactoideae
Tribe:	Rhipsalideae; DC.
Genera
	See text.

The Rhipsalideae are a small tribe of cacti, comprising four or five genera (and around 60 species). They grow on trees (epiphytes) or on rocks (lithophytes), where they either hang down or form creeping or upright shrubs. Their flowers open in the day and remain open at night; they may be either radially symmetrical (regular) or bilaterally symmetrical (zygomorphic). The fruits are berry-like, fleshy with smallish seeds.^[2]

They are found mainly in the east of South America, with a centre of diversity in Bolivia,^[3] but some species occur in Central America and North America; one species, Rhipsalis baccifera, also occurs in the Old World.^[2]

Taxonomy

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]

Rhipsalideae

Schlumbergera s.l.

Rhipsalidopsis

	Rhipsalidopsis rosea

	Rhipsalidopsis gaertneri

Schlumbergera s.s.

Schlumbergera opuntioides

	Schlumbergera lutea

	3 other Schlumbergera spp. included in the 2011 study

Hatiora s.s. (3 spp.)

Lepismium

Rhipsalis

Genera

The genera included in the tribe as of January 2023^[update] are as follows,^[9] with species counts based on Plants of the World Online:

Hatiora Britton & Rose – 3 species;^[13] synonyms include Epiphyllopsis, Hariota DC non Andan., Pseudozygocactus; it has been included in Rhipsalis^[7]
Lepismium Pfeiff. – 7 species;^[14] synonyms include Acanthorhipsalis, Lymanbensonia, Pfeiffera; it has been included in Rhipsalis^[15]
Rhipsalidopsis Britton & Rose – 2 species^[12] (plus an artificial hybrid); included in Schlumbergera by Calvente et al. (2011)
Rhipsalis Gaertn. – 45 species;^[16] synonyms include Erythrorhipsalis;^[17] most species in the tribe have been placed here at one time or another
Schlumbergera Lem. – 7 species;^[18] synonyms include Epiphyllanthus, Epiphyllum Pfeiffer non. Haworth and Zygocactus^[19]

Illustration of Hatiora salicornioides
Lepismium cruciforme
Rhipsalidopsis rosea
Rhipsalis pilocarpa fruit
Illustration of Schlumbergera truncata

References

^ ^a ^b Reveal, James L. (2011), "Rhipsalideae", Indices Nominum Supragenericorum Plantarum Vascularium, Plant Biology section, Cornell University, retrieved 2023-01-25
^ ^a ^b Anderson 2001, p. 102
^ Hogan, C. Michael & Dawson, Arthur (2012), "Cactus", in Cleveland, Cutler J. (ed.), Encyclopedia of Earth, Washington, D.C.: Environmental Information Coalition, National Council for Science and the Environment, retrieved 2012-01-29
^ de Candolle, Augustin Pyramus (1828), "Trib. II. Rhipsalideae", Prodromus systematis naturalis regni vegetabilis, 3 (in Latin), pp. 475–476
^ ^a ^b Anderson 2001, p. 375
^ McMillan, A.J.S.; Horobin, J.F. (1995), Christmas Cacti : The genus Schlumbergera and its hybrids (p/b ed.), Sherbourne, Dorset: David Hunt, ISBN 978-0-9517234-6-3, pp. 12–13
^ ^a ^b Anderson 2001, pp. 375–377
^ Barthlott, W. & Taylor, N.P. (1995), "Notes towards a monograph of Rhipsalidaeae (Cactaceae)", Bradleya, 13 (13): 43–79, doi:10.25223/brad.n13.1995.a7, S2CID 89883634
^ ^a ^b Calvente, Alice; Zappi, Daniela C.; Forest, Félix & Lohmann, Lúcia G. (2011), "Molecular phylogeny of tribe Rhipsalideae (Cactaceae) and taxonomic implications for Schlumbergera and Hatiora", Molecular Phylogenetics and Evolution, 58 (3): 456–468, doi:10.1016/j.ympev.2011.01.001, PMID 21236350
^ Korotkova, Nadja; Borsch, Thomas; Quandt, Dietmar; Taylor, Nigel P.; Müller, Kai F. & Barthlott, Wilhelm (2011), "What does it take to resolve relationships and to identify species with molecular markers? An example from the epiphytic Rhipsalideae (Cactaceae)", American Journal of Botany, 98 (9): 1549–1572, doi:10.3732/ajb.1000502, PMID 21900612
^ Lodé, Joël (2015), "Rhipsalidopsis", Taxonomy of the Cactaceae : a new classification of cacti based on molecular research and fully explained (vols. 1 and 2), Cuevas del Almanzora, ISBN 978-84-617-2974-6, accessed 2019-06-19 via Rhipsalidopsis
^ ^a ^b "Rhipsalidopsis Britton & Rose", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2023-01-24
^ "Hatiora Britton & Rose", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2023-01-24
^ "Lepismium Pfeiff.", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2023-01-24
^ Anderson 2001, pp. 386–391
^ "Rhipsalis Gaertn.", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2023-01-24
^ Anderson 2001, p. 612
^ "Schlumbergera Lem.", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2023-01-24
^ Anderson 2001, p. 623