Rebutia

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Rebutia is a genus of flowering plants in the family Cactaceae, native to Bolivia and Argentina. The limits of the genus have varied widely, depending on whether genera such as Aylostera and Weingartia are included or treated separately. since December 2024Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"., Plants of the World Online accepted only three species of Rebutia. A very large number of plants that have been treated in cultivation as species of Rebutia are now generally regarded as varieties, forms or synonyms of a much smaller number of species, or have been transferred to other genera. Plants treated as Rebutia are generally small, colorful cacti, globular in form, which freely produce flowers that are relatively large in relation to the body. They have no distinctive ribs, but do have regularly arranged small tubercles. They are considered fairly easy to grow and they may produce large quantities of seeds that germinate freely around the parent plant.

Taxonomy

The genus was designated in 1895 by Karl Moritz Schumann[1] and named after Pierre Rebut (1828–1902), a French cactus nurseryman. The type species is R. minuscula, which has been in cultivation since 1887.[2][3]

Historical limits of the genus

There has been considerable debate about the extent of the genus. In the middle of the twentieth century there was a tendency to separate groups of plants within Rebutia as new genera, e.g. Mediolobivia, whereas towards the end of the century the reverse tendency predominated, with genera previously regarded as separate, such as Weingartia, being subsumed within Rebutia. At the beginning of the twenty-first century there was a broad consensus, as reflected in Kew's list of Vascular Plant Families and Genera, that the following genera should be regarded as synonyms of Rebutia:[4]

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(The generic names Bridgesia, Spegazzinia, Echinorebutia, Eurebutia, Mediorebutia, Neogymnantha and Setirebutia are invalid, the first two because they are homonyms of Bridgesia Bert. ex Cambess. and Spegazzinia Backeb. respectively,[5] the remainder for lack of any valid publication. Some of these are nevertheless valid names for subdivisions of the genus.Script error: No such module "Unsubst".)

The history of the taxonomic treatment of the genera Rebutia, Aylostera, Weingartia, Sulcorebutia and Cintia is summarized below.[6]

K. Schumann Britton & Rose Spegazzini A. V. Frič
1895 1896 - 1921 1922 1923 1932 - 1938
Rebutia
genus novum		 Echinocactus
Echinopsis		 Rebutia
renovation		 Rebutia
Rebutia
Rebutia Rebutia Aylostera
genus novum		 Digitorebutia, Cylindrorebutia,
Echinorebutia, Setirebutia,
Hymenorebutia, Scopaerebutia
C. Backeberg Donald ICSG Anderson Rowley Mosti & Papini[6]
1966 1975 2001 2009 2011
Rebutia K. Schum. Rebutia
sectio Rebutia		 Rebutia Rebutia
subg. Rebutia		 Rebutia
Aylostera Speg. Rebutia
sectio Aylostera		 Rebutia Aylostera
subg. Aylostera		 Aylostera
subg. Aylostera
Mediolobivia Backeb. Rebutia
sectio Setirebutia,
Digitorebutia, Cylindrorebutia 		Rebutia Aylostera
subg. Mediolobivia		 Aylostera
subg. Mediolobivia
Weingartia Werderm.
syn.Spegazzinia Backeb.		 Weingartia Rebutia Rebutia
subg. Weingartia		 Weingartia
Sulcorebutia Backeb. Sulcorebutia Rebutia Rebutia
subg. Sulcorebutia		 Weingartia
incl. Cintia

The variation in the treatment of the genus is illustrated by the difference between Anderson in 2001, who synonymized genera including Aylostera and Weingartia with Rebutia, thereby creating a genus with as many as 41 species, and Mosti et al., who in 2011 separated Aylostera and Weingartia (including Cintia and Sulcorebutia) from Rebutia.[6] since December 2022Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"., Plants of the World Online agreed with Mosti et al. in keeping Aylostera separate,[7] and also merged Cintia and Sulcorebutia into Weingartia,[8] resulting in Rebutia having only three species.[9]

Phylogeny

Molecular phylogenetic studies showed that when broadly circumscribed, the genus Rebutia was polyphyletic. Sulcorebutia and Weingartia were kept as separate genera in a 2007 study whose summary cladogram for those species studied is shown below.[10] Script error: No such module "Clade".

Species formerly classified as Weingartia, Sulcorebutia and Cintia showed a close relationship to each other and to species of Rebutia with naked pericarpels (Rebutia II above), including the type species R. minuscula. The larger group of species of Rebutia studied, those with hairy or bristly pericarpels, formed a separate, more distantly related clade (Rebutia I). It was suggested that these be excluded from the genus,[10] and since December 2024Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"., Plants of the World Online placed them in the genus Aylostera.[7]

Species

The number of species has been debated, because of disagreement both over what constitutes the genus and what constitutes a species. A very large number of plants that have circulated as species of Rebutia are now generally regarded as varieties, forms or synonyms of others.[11] E. F. Anderson recognised 41 species in 2001.[12] Only the following three species were accepted by Plants of the World Online since December 2024Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"..[9]

Image Scientific name Distribution
File:Rebutia fabrisii aureiflora 1.jpg Rebutia fabrisii Rausch Argentina
File:Rebutia minuscula (491293348).jpg Rebutia minuscula K.Schum. Argentina
File:Aylostera (Rebutia) padcayensis (5734625098).jpg Rebutia padcayensis Rausch Bolivia to Argentina (Salta)

Gallery

Notes and references

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  1. ↑ Monatsschrift für Kakteenkunde, 5: 102, 1895
  2. ↑ N. L. Britton, J. N. Rose, The Cactaceae, Washington, 1920, vol.III, p.45.
  3. ↑ Archives départementales du Rhône. death record. Chazay-d'Azergues. 14 March 1902.
  4. ↑ Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ a b c Script error: No such module "citation/CS1".
  7. ↑ a b Template:Cite POWO
  8. ↑ Template:Cite POWO
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".. Summary cladogram based on Fig. 2.
  11. ↑ Cf. the list of approximately two hundred names under Rebutia (not to mention those given under other genera) provided in B. Fearn and L. Pearcy, The Genus Rebutia, 1895-1981, Matlock: Abbey Brook, 1981, pp.60-71.
  12. ↑ Edward F. Anderson, The Cactus Family, Portland, Oregon: Timber Press, 2001, pp.599-611.

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External links

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