Mammillaria
Known Species
| Species (common name) | Origin | Body form & size | Spines | Flower | Notable / rarity |
|---|---|---|---|---|---|
| Mammillaria napina | Puebla (Tehuacán Valley), Mexico | Solitary, small globose, retracts into soil on a tuberous taproot | Short pectinate white radials pressed flat; no central spines | Pink, apical | Geophytic taproot; restricted Tehuacán limestone endemic |
| Mammillaria pectinifera Comb cactus | Puebla (Tehuacán Valley), Mexico | Solitary miniature, flattened-globose, often withdrawn level with the soil | Comb-like (pectinate) radials laid flat to the body; no central spines | Pale pink to cream | Former genus Solisia; about 18 fragmented Puebla populations |
| Mammillaria schwarzii | Guanajuato, Mexico | Clustering into low mounds of heads around 3 cm across | Dense glassy white radials cloaking the body; central spines fine and inconspicuous | Cream to pale pink | Single volcanic-cliff population in northern Guanajuato |
| Mammillaria duwei | Guanajuato (near San Luis de la Paz), Mexico | Solitary to few-headed, soft flattened-globose body | Feathery (plumose) white radials with one hooked central spine | Creamy yellow with a brownish midstripe | About 500 known individuals; Guanajuato endemic |
| Mammillaria herrerae Golf ball cactus | Querétaro, Mexico | Solitary, tight globose ball roughly 2 to 3.5 cm | 100+ short white radials in a dense net; no central spines | Large pink-violet, oversized for the plant | Single-location endemic; IUCN Critically Endangered |
| Mammillaria herrerae f. albiflora | Querétaro, Mexico (same cliff as the type) | As herrerae: solitary globose ball under a white radial net | 100+ short white radials; no central spines | White to cream (its defining trait) | White-flowered form of herrerae; known only from the type locality |
| Mammillaria luethyi | Coahuila, Mexico | Clustering; elongated cylindrical tubercles tipped with spine clusters | Minute pectinate white spine clusters ringing each tubercle tip; no hooks | Large deep magenta with a pale throat | Rediscovered in 1996 after about 44 years lost to science |
| Mammillaria huitzilopochtli | Oaxaca (Tomellín Canyon), Mexico | Solitary, small globose to short-cylindric | Short radials with aggressive hooked central spines | Deep purplish-pink | Named for the Aztec war god; narrow Oaxaca endemic |
| Mammillaria bertholdii | Oaxaca, Mexico (single locality) | Solitary miniature, globose, on a tuberous root | Fine radials with hooked central spines | Deep magenta-purple | Described in 2016; fewer than 2,000 individuals known |
| Mammillaria crucigera | Oaxaca-Puebla border, Mexico | Clustering into mounds of small columnar heads | Tiny radials set in a cross pattern at each areole; the name means cross-bearing | Small, deep pink | Two subspecies, both restricted to the Oaxaca-Puebla border |
| Mammillaria humboldtii | Hidalgo and Querétaro, Mexico | Clustering into snowball-like mounds of small heads | 80+ fine white radials smothering the body; no central spines | Purplish-pink to magenta | Limestone cliff endemic; densely white snowball habit |
Every species above is grown from seed at rarecactus.com, most of them slow Mexican miniatures we raise under glass rather than graft. Swipe the table sideways on a phone to compare all eleven.
Trace any specimen back to its wild origin in our Mammillaria field numbers database.
What is Mammillaria, the pincushion cactus?
Mammillaria is the largest genus in the family Cactaceae, comprising 143 accepted species under the current Kew POWO circumscription (Breslin et al. 2021), all characterized by conical or cylindrical tubercles arranged in Fibonacci spirals rather than continuous ribs. The common name “pincushion cactus” refers to both Mammillaria and the closely related Escobaria, though Mammillaria is the far larger group.
Where does Mammillaria grow in the wild?
Approximately 98% of accepted species are native to Mexico, with the Tehucán-Cuicatlán Valley and the Chihuahuan Desert holding the highest density. The genus reaches into the Sonoran and Chihuahuan deserts of the southwestern United States and south to Colombia and Venezuela. Endemism within Mexico runs at roughly 88%, meaning almost nine in ten species occur nowhere else on Earth.
What are pectinate spines, and which Mammillaria species have them?
Pectinate spines are radial spines arranged in flat, comb-like rows pressed tight against the tubercle surface, completely obscuring the plant body beneath interlocking white spine-fans. The feature appears in some of the most sought-after collector species: Mammillaria pectinifera, which carries 40 or more white radial spines per areole; M. perezdelarosae subsp. andersoniana, with 50 to 63 pectinate radials per tubercle; and M. bertholdii, described from Oaxaca in 2014.
How do Mammillaria flowers form their characteristic ring?
Mammillaria flowers emerge from the axils of tubercles formed during the previous growing season, not from the current year’s growth apex, producing a ring or halo of blooms encircling the upper third of the stem. This ring-forming mechanism is taxonomically diagnostic: it separates Mammillaria from Coryphantha, whose flowers emerge at the growing point.
How fast does rare Mammillaria grow from seed?
Common species can reach first bloom in 2 to 3 years. Rare pectinate-spine species are a different timeline: seed grown M. herrerae typically requires 8 to 12 years to reach flowering size. Grafting accelerates that to under two years but produces plants that never settle into the flat-globose habit that seed grown plants maintain.
Which Mammillaria species are the most endangered?
Several species are assessed as Critically Endangered by the IUCN. Mammillaria duwei has an area of occupancy of just 35 km² and is known from one location in Mexico. M. perezdelarosae subsp. andersoniana is estimated at fewer than 1,000 individuals in 1,000 m² of habitat in Zacatecas. M. herrerae numbers only a few hundred in the wild, with very low seedling recruitment.
Are Mammillaria species protected under CITES?
The entire Cactaceae family has been listed on CITES Appendix II since 1975, requiring valid export permits and documentation confirming specimens were not taken illegally. A handful of Mammillaria species, including M. pectinifera and M. solisioides, carry the stricter Appendix I listing, which prohibits commercial international trade. Within Mexico, the most threatened species receive additional protection under NOM-059-SEMARNAT-2010.
How should rare Mammillaria be cultivated?
Rare pectinate-spine species grow in mineral-poor substrates on calcareous or igneous rock faces at 1,900 to 2,300 m elevation. A substrate of 70 to 80% inorganic mineral material (pumice, decomposed granite, or lava rock) mixed with a small fraction of low-nutrient organic material replicates those conditions. Water thoroughly during the growing season only when the substrate has dried completely; in winter, a full dry rest at cool temperatures triggers the spring flowering flush.