Scientific taxonomy article
Accepted name and publication history
The current Kew backbone accepts Mammillaria spinosissima; the standardized author citation is Lem. Charles Lemaire published the name in 1838 on page 4 of Cactearum Aliquot Novarum ac Insuetarum in Horto Monvilliano. 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. The current Kew backbone contains four homotypic names and 106 heterotypic names, producing a 110-name historical surface that must not be confused with modern trade labels for spine colour.
Taxon boundary and infraspecific treatment
In the Kaktüs Doktoru backbone, the species is a child of Mammillaria. POWO lists no accepted subordinate rank at the current species node and treats subsp. pilcayensis and subsp. tepoxtlana as species synonyms. WFO instead displays pilcayensis, the nominal spinosissima, and tepoxtlana as included subspecies. The payload follows POWO and records the disagreement explicitly. 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 recognized by globose to cylindrical stems, dense radial spines on distinct tubercles, stronger central spines, and pink-to-red flowers that may form near the stem apex. Spine colour can appear white, yellowish, brownish, or reddish and is not sufficient for species identification on its own. 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.3
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.4 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 Mexico from Durango to Morelos and Guerrero.1 POWO records the species as a succulent subshrub of desert and dry-shrubland biomes. Its broad geographic and nomenclatural circumscription means populations should not be generalized from one spine colour. The stored conservation category is DD.5 The IUCN assessment assigns Data Deficient, so the previous live LC field should be corrected to DD. DD does not mean safe; it means the available information is insufficient for a robust global risk estimate.
Synonymy and retrieval
Kew accepts 110 synonyms at the species node: Four homotypic names and 106 heterotypic names cover a broad naming history around polycentra, pilcayensis, tepoxtlana, umbrina, and historical colour-form treatments. These are not canonical routes; they document nomenclatural history and support retrieval of older literature. Trade names such as “red-headed Irishman” and modern selected spine colours are not scientific synonyms unless they appear as botanical names in the maintained backbone.1
References
- Plants of the World Online. “Mammillaria spinosissima Lem.” Royal Botanic Gardens, Kew. Accessed: 2026-08-04. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:135156-1 ↩
- International Plant Names Index. “Mammillaria spinosissima Lem.” Accessed: 2026-08-04. https://www.ipni.org/n/135156-1 ↩
- World Flora Online. “Mammillaria spinosissima Lem.” Accessed: 2026-08-04. https://www.worldfloraonline.org/taxon/wfo-0001288977 ↩
- 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 spinosissima.” https://www.iucnredlist.org/species/151884/121512181 ↩
