Scientific taxonomy article
Accepted name, authorship, and first publication
The 2026 Kew backbone accepts Aylostera fiebrigii; the standardized author citation is (Gürke) Backeb. Backeberg published the accepted combination in 1936 in Kaktus-ABC 274; the basionym is Gürke’s 1905 Echinocactus fiebrigii. IPNI records nomenclatural authorship and place of publication, while current acceptance, native distribution, and the species synonym surface follow POWO.12
A basionym or former combination does not mean that the current species name is “wrong.” Nomenclature tracks how the same type has been named in different genera or ranks. Echinocactus fiebrigii Gürke is therefore retained as a historical bridge, while the Kaktüs Doktoru canonical species route remains under Aylostera fiebrigii.
The Aylostera–Rebutia boundary and source opinions
A 2016 cpDNA and AFLP study recovered Aylostera as monophyletic, supported its separation from the clade containing the type species of Rebutia, and identified three principal clades.3 The same work proposed a narrower classification recognizing nine species from molecular and morphological evidence. The maintained Kew backbone accepts Aylostera fiebrigii as a distinct species.14
The World Flora Online/Caryophyllales backbone retains a broader Aylostera deminuta treatment and links some names in this batch to that synonym surface.5 This difference is not hidden behind a claim that one source is simply “wrong.” Kaktüs Doktoru follows the current Kew acceptance for its canonical node and records WFO as an alternative taxonomic application. Readers can therefore understand why older or broader sources may retrieve the same material under Rebutia or a broad A. deminuta concept.
Species boundary and synonymy
Kew accepts 37 synonyms at the species node: two homotypic names and 35 heterotypic names around albiareolata, albipilosa, buiningiana, cajasensis, cintiensis, donaldiana, jujuyana, kieslingii, nitida, nogalesensis, pulchella, robustispina, tamboensis, vallegrandensis, and walteri. These rows are not canonical routes; they preserve retrieval of the basionym, former generic combinations, and historical species applications. Aylostera muscula is separately accepted by Kew and is not one of the 37 Fiebrigii synonyms; the two-product Muscula record is not folded into this species package. Synonym count is not a count of wild populations or a measure of conservation security. Heterotypic synonyms in particular show that historically described taxa based on different types have been united by the current backbone; they do not imply that every living specimen is morphologically identical.
The accepted species node owns only names supported for that species. Related species, commercial cultivars, colour selections, and product labels are not added unless the maintained botanical backbone treats them as synonyms. This prevents search visibility from flattening taxonomy.
Diagnostic characters
A globose to short-cylindrical body, areoles on distinct tubercles, variable radial and central spine arrangements, and orange-to-red flowers are evaluated together. Under Kew’s broad synonym concept, one spine colour or body form is not a reliable boundary. Members of Aylostera are recognized through small globose to short-cylindrical bodies, tuberculate surfaces, areole and spine arrangements, and flowers large relative to the stem. The 2016 key uses combinations of characters rather than one photographic feature.3
Identification should evaluate body shape, tubercle pattern, areole spacing, number and direction of radial and central spines, floral tube, flower colour, fruit, seed, and reliable provenance. Nursery conditions can alter spine length, epidermal colour, offsetting, and flowering time. A product photograph is therefore neither a record of a wild population nor a nomenclatural type.
Native range, habitat, and conservation
Kew records the native range as Bolivia to north-western Argentina and describes the species as a succulent subshrub of desert or dry-shrubland biomes.1 Kew records the species as a succulent subshrub of desert or dry-shrubland biomes. A broad geographic and nomenclatural surface does not make every commercial variation a separate wild species. The geographic statement describes wild distribution rather than the place of commercial production; nursery availability must not be confused with habitat security.
The verified global category is stored as LC.6 The IUCN assessment is Least Concern under the synonym Rebutia fiebrigii, so the live LC value is retained. A large synonym count is not a measure of conservation security or local population health.
Kaktüs Doktoru release and ownership boundary
This source updates only the species taxonomy node and its linked botanical-dictionary record. Aylostera muscula is separately accepted by Kew and is not one of the 37 Fiebrigii synonyms; the two-product Muscula record is not folded into this species package. Product descriptions, stock, price, SKU, media, categories, variants, product translations, canonical slugs, and product–botanical links are not owned by the payload. They remain protected live-state evidence for disposable and production verification.
References
- Plants of the World Online. “Aylostera fiebrigii (Gürke) Backeb..” Royal Botanic Gardens, Kew. Accessed: 2026-08-04. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:27585-2 ↩
- International Plant Names Index. “Aylostera fiebrigii (Gürke) Backeb..” Accessed: 2026-08-04. https://www.ipni.org/n/27585-2 ↩
- Ritz, C. M. et al. “Molecular phylogenetic relationships of the Andean genus Aylostera Speg. (Cactaceae, Trichocereeae), a new classification and a morphological identification key.” Plant Systematics and Evolution 302: 763–780. https://doi.org/10.1007/s00606-016-1296-4 ↩
- Plants of the World Online. “Aylostera Speg.” Royal Botanic Gardens, Kew. Accessed: 2026-08-04. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:295167-2 ↩
- World Flora Online. “Aylostera deminuta (F.A.C.Weber) Backeb.” Accessed: 2026-08-04. https://www.worldfloraonline.org/taxon/wfo-0000557641 ↩
- IUCN Red List of Threatened Species. “Rebutia fiebrigii.” https://www.iucnredlist.org/species/152694/121605189 ↩
