Scientific taxonomy article
Accepted name and publication history
The current Kew backbone accepts Mammillaria luethyi; the standardized author citation is G.S.Hinton. George S. Hinton published the species from Coahuila, Mexico, in 1996 in Phytologia 80(1): 58–61. IPNI supplies nomenclatural authorship and place of publication, while current acceptance, synonymy, and native distribution follow POWO.12
The name was published directly in Mammillaria and has no separate basionym. The 2024 combination Cryptocarpocactus luethyi is based on the same nomenclatural type; the current Kew backbone retains it as a synonym.
Taxon boundary and infraspecific treatment
In the Kaktüs Doktoru backbone, the species is a child of Mammillaria. Kew lists no accepted subspecies or variety on the current species page. This package updates only the canonical species node and its linked botanical-dictionary record; it does not rewrite the genus, flatten accepted subordinate ranks into species synonymy, or alter the product.
Diagnostic characters
The species is exceptionally distinctive within Mammillaria because its minute spines branch repeatedly near their tips.3 The stem is small and often sits close to the substrate; the spine architecture remains a central character with or without flowers. Members of Mammillaria have distinct tubercles rather than continuous ribs, and flowers generally arise from reproductive areoles in the tubercle axils. Identification should not be reduced to one spine colour or a commercial photograph; tubercles, areoles, spines, flowers, fruits, and provenance should be assessed together.4
Phylogenetic context
A 2021 molecular study showed that the traditional broad concept of Mammillaria was not a single natural lineage and that generic limits within the mammilloid clade required reassessment.5 The current Kew backbone nevertheless accepts this species in Mammillaria. Phylogenetic context does not automatically rename the accepted species; it explains why historical generic combinations and appearance-based groupings must be checked against a maintained backbone.
Native distribution and conservation
Kew records the native range as Coahuila in north-eastern Mexico.1 POWO records the species as a succulent subshrub of desert and dry-shrubland biomes. Its narrow Coahuila range and sensitivity of wild populations to collection pressure make legal, traceable nursery provenance important. The stored conservation category is VU.6 The IUCN assessment assigns Vulnerable, and Kew’s 2024 risk prediction also flags the species as threatened. The former live CR field conflicts with the current official assessment and should be corrected to VU; that correction does not minimize risk to wild populations.
Synonymy and retrieval
Kew accepts 1 synonym at the species node: Cryptocarpocactus luethyi is a homotypic generic combination published in 2024. These are not canonical routes; they document nomenclatural history and support retrieval of older literature. Garden-origin yellow, crested, or abnormal forms are not scientific synonyms.1
References
- Plants of the World Online. “Mammillaria luethyi G.S.Hinton.” Royal Botanic Gardens, Kew. Accessed: 2026-08-04. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:303617-2 ↩
- International Plant Names Index. “Mammillaria luethyi G.S.Hinton.” Accessed: 2026-08-04. https://www.ipni.org/n/303617-2 ↩
- Butterworth, C. A. & Wallace, R. S. “Phylogenetic relationships in Mammillaria (Cactaceae) using chloroplast sequence variation.” American Journal of Botany 91(7): 1086–1098. https://doi.org/10.3732/ajb.91.7.1086 ↩
- World Flora Online. “Mammillaria luethyi G.S.Hinton.” Accessed: 2026-08-04. https://www.worldfloraonline.org/taxon/wfo-0001254427 ↩
- Breslin, P. B., Wojciechowski, M. F. & Majure, L. C. “Phylogenetic relationships within Mammillaria (Cactaceae) and implications for the circumscription of the genus.” Taxon 70(2): 308–323. https://doi.org/10.1002/tax.12451 ↩
- IUCN Red List of Threatened Species. “Mammillaria luethyi.” https://www.iucnredlist.org/species/40839/121500240 ↩
