Welcome to the Mammillaria Society

PLEASE NOTE: To join the Society or to renew an existing membership please go to Membership for 2018


Here you'll find details about the Society, about membership, and about our Journal and Annual Meetings and Shows. We try to feature a different species of MammillariaCoryphanthaEscobaria, NeolloydiaThelocactus or Turbinicarpus each month, and sometimes these include newly described species.

We hope you will share our delight in this genus of plants, that stretches from Central America and the Caribbean through all of Mexico and deep into the Western States of the USA. New discoveries are being made all the time, and this web site will feature them once described in the appropriate Journal.

Please also visit the Mammillaria Forum to talk with other Mammillaria enthusiasts in the UK and around the world, but do please note that while this is supported by the Society it is not run by us.

You do not need to register to look at our free content. You can see our events for the year, and there is a lot of information in the Plants of the Month section, and details of other useful websites etc. 

Mammillaria Society members who want access to the Members area should contact either Chris Davies or Pete Arthurs, who will then register you and give you access. This Members Only area contains digital versions of our Journals from 2011 onwards which may be downloaded. The provision of access will typically take up to a few days after contacting us. It is unfortunately necessary to do it this way as we have been receiving a lot of false registrations recently and the workload to remove these is much more than registering bona fide Society Members.  Trying to Register will take you straight to the logon page, and so will fail.

If you have any problems, please contact the webmaster for the site.



We appear to have a problem with the top menu on the Home page. To join the Society or to renew an existing membership please go to Membership for 2018

24th May Update - New regulations are shortly to come into effect with regard to the protection of the data that the Society holds about its members. A formal letter is being sent with the May journal to all members, which is reproduced here

Links - containing Cactus Explorer link to Dr David Hunt's Huitzilopochtlia, and the recently revitalised Mammillarias.net.

Please Note: If you don't receive an activation email after registering, do check your spam folders. Note: Most pictures copyright of Chris Davies. Please contact the This email address is being protected from spambots. You need JavaScript enabled to view it.if you wish to use any of these.

Plant of the Month

(click here for previous Plants of the Month)

Mammillaria sphaerica


Mammillaria sphaerica in cultivation


Mammillaria sphaerica is fairly obviously related to Mammillaria longimamma, featured in our last Plant of the Month. It is however very distinct in where it comes from, as it's habitat is in southern Texas and Tamauilpas in northern Mexico.

It tends to grow smaller than its southern cousin, clumping less profusely, and making in time a clump of no more that 8" (20cm) or so. It has shorter tubecles, and unlike most forms of it's cousin, has a thick rootstock, though given enough room, it isn't a difficult plant to cultivate.

It is described as clustering, stems to 5cm in diameter, axils slightly woolly, radial spines 12 - 14, whitish to pale yellow, 6-9mm long, straight to slightly tortuous. There is one yellowish central spine, and its flowers are lemon yellow, 6-7cm wide.


Mammillaria sphaerica in habitat nearSan Antonio, Texas, USA


Mammillaria sphaerica


 Plant of the Month

(click here for previous Plants of the Month)

Mammillaria longimamma



Mammillaria longimamm in cultivation


Mammillaria longimamma is probably one of the most popular species in the Dolicothele subgroup. It’s large yellow flowers open wide to a diameter of 2-3 inches on a good sunny day.

It comes from the states of Hidalgo and Queretaro, and is especially widespread around the Barrranca de Meztitlan.

It clusters both in cultivation and in habitat, forming mats of long tubercled heads (hence its name) to as much as 30cms or more. The tubercles have variable number of radial spines, between 6 and 10 have been observed, and the typical form has usually a single central spine, occasionally up to 3. It has a well known variety, var. uberiformis, and this has no central spine. This is not consistent, even within a single small group of plants, let alone a population, though a useful descriptive, it is best only used in that way, and not used as a species or subspecies.

Cultivation is quite easy, and it seems to like a reasonably rich compost, though still one with decent drainage. Then it will slowly offset, and reward you with those large flowers in mid summer.


Mammillaria longimamma CD12/129, west of Bellavista del Rio, Qro.


Mammillaria of the Month

(click here for previous Mamms of the Month)


Mammillaria albicans ssp.fraileana, north of La Paz, BCS.  Copyright The Mammillaria Forum 2013  

This is the plant that we all know and love as Mammillaria fraileana, the current name being the result of the earlier description of Mammillaria albicans.

It is one of the most charasmatic plants of the Baja peninsular, often a bit untidy in growth, but always superb when in flower.

Originally reported in 1911 from  Pichilingue, north of La Paz, it wasn't formally described until 1925. It can be found around the bottom of the Baja peninsular, where it grows on non-calcareous rocks. The small cluster of stems, unevenly set around the bas eof the main stem, elongate to about 15cm long or more in cultivation. The spine colour varies from dull brown to dark brown, giving the plant a brownish appearnce, despite the white radial spines. It is when in flower, as shown above that the plant really come sinto its own. Not surprisingly for a plant of this Series and nature of habitat, light watering is recommended.


 Mammillaria of the Month

(click here for previous Mamms of the Month)

Mammillaria albicans ssp. albicans



Mammillaria albicans ssp. albicans SB1251 from San Juan del Costa, north of La Paz, BCS.  Copyright Chris Davies 2013  

This is a lovely plant, the almost clear white flowers enhancing the mostly white spination, all set off by the long purple stigmas. It was originally called Mammillaria slevinii, and then albicans, and eventually M. fraileana and M. albicans were merged under the species name of M. albicans.
It is a rather slower growing plant than the subspecies (as it is now classed) of M. albicans ssp. fraileana, and doesn't exhibit the often untidy growth of that subspecies. Interestingly it can be found in forms with straight central spines, and also with hooked central spines (the Lau 1374 form is one such). In time it can make relatively slender stems of up to 30cm tall, and offsets somewhat reluctantly. As with most of the hooked spined plants of the Ancistracanthae from Baja California, it likes as much sun as you can give it, a very gritty, open compost, and water when fully dry.


 Mammillaria of the Month

(click here for previous Mamms of the Month)

Mammillaria compressa ssp. centralifera


Mammillaria compressa ssp. centralifera CD12/485, west of Cerritos, SLP.  Copyright Chris Davies 2013  

Mammillaria compressa ssp. centralifera differs from the species, seen here last month, because of the presence of long central spines, usually one, sometimes two, and is more northerly distributed. It is found in Queretaro, San Luis Potosi and Tamaulipas. The photo above was taken last year in habitat, and clearly shows the long central spine, and the greater amount of axillary wool of this subspecies.

It has the same variable characteristics of the species, readily offsetting and growing steadily, perhaps not quite as large clumps either. It will fill a large pot or pan in time however, so space is needed if it is to show of its best.. The spines vary in length, usually chalky white with brown tips, with 4 or 5 radial spines and 1 or 2 cental spines, often curved and to 6cm long in some clones.
It also has bristles from the axil, and frequently wool as well, sometimes quite masking the bristles.

It flowers quite readily, and bright purple-pink rings around each head make this species a beautiful one at flowering time, which is usually May to June.

Members Sign-Up

Members of the Mammillaria Society are invited to join the website to receive members-only services.

Click the Join button below and fill in your details. 

You must put your full name in the Name field to be registered as a member. The User-Name can be anything and it is this that is viewable by other members. Join the website