= Mammillaria mazatlanensis var. monocentra R.T.Craig
Mammill. Handbook 242. 1945 R.T.Craig
Accepted Scientific Name: Mammillaria mazatlanensis K.Schum. ex Gürke
Monatsschr. Kakteenk. 11: 154 (-155; fig.). 1901 as Mamillaria matzatlanensis
Mammillaria occidentalis var. monocentra (Mammillaria mazatlanensis var. monocentra) Photo by: Carolina González
Origin and Habitat: Mammillaria mazatlanensisSN|9256]]SN|9256]] var. monocentra is known only from the type locality in the Yaqui Valley, Sonora, Mexico.
Habitat and ecology: Arid habitats, Lower Sonoran Zone.
Synonyms:
See all synonyms of Mammillaria mazatlanensis
Description: Mammillaria mazatlanensisSN|9256]]SN|9256]] var. monocentra Craig, is one of the innumerable forms of Mammillaria mazatlanensisSN|9256]]SN|9256]] which is a widespread and morphologically variable taxon. It is a small globular or cylyndrical cactus forming clumps with many heads. It distinguishes from the type species in having only a single central spine about 7 mm. long. The flowers of this species are bright pink 3 cm or so, so freely produced that a clump in flower is like a prickly bouquet. The varietal name “monocentra” is not accepted by many botanists that treat it as synonym, but it still has a value for a collector because they identify plants with particular characters.
Stem: Oblong to slender-cylindrical often branching from the base.
Tubercles: Short, conical with watery sap. Axils glabrous.
Central spine: One, straight or slightly bent to form an incomplete hook, brownish-red.
Radial spines: 15-16, white.
Subspecies, varieties, forms and cultivars of plants belonging to the Mammillaria mazatlanensis group
Mammillaria mazatlanensis K.Schum. ex Gürke: has 1—3 central spines, 12-18 radials, and pink to carmine red to reddish purple flowers. Distribution: occurs throughout the range of the species. - Mammillaria mazatlanensis var. monocentra R.T.Craig: has a single brownish-red central spine about 7 mm long, straight or slightly bent to form an incomplete hook, and 15-16 white radials. Distribution: Yaqui Valley, Sonora, Mexico.
- Mammillaria mazatlanensis subs. patonii (Bravo) D.R.Hunt: has 4 central spines, 13-15 radials, and bright purple flowers. Distribution: Tres Marias Islands off the coast of Nayarit, Mexico.
- Mammillaria sinaloensis (Rose) Mottram: is the hooked spine form of Mammillaria mazatlanensis. Distribution: Sinaloa and Southern Sonora, Mexico.
Bibliography: Major references and further lectures
1) Forrest Shreve, Ira Loren Wiggins “Vegetation and Flora of the Sonoran Desert”, Volume 1 Stanford University Press, 1964
2) “the journal of the UK Mammillaria society” 1965
3) “The Cactus and Succulent Journal of Great Britain”, Volume 42, page 50, 1980
Cultivation and Propagation: Mammillaria mazatlanensisSN|9256]]SN|9256]] is somewhat difficult to cultivate. During the summer it is best to keep the plants outside where the temperature can rise to over 30° C with no harm to the plant, recommended for any collection that needs lots of light with ample airflow.
Growth rate: It is a small growing, but easily flowering species. It takes several years to offset, but once it starts it can fill a 25 cm pot in just a few years given the best conditions.
Soils: Use a an open and free draining mineral compost with little organic matter (peat, humus) that allows therefore roots to breath (as it is rot prone).
Repotting: Repotting every 2-3 years. As it is especially prone to rot under-pot in a smaller container filled with very porous compost. Use pot with good drainage.
Watering: It likes a winter's rest and should be kept almost completely dry during the winter months, If the soil is allowed to be dry for too long root loss could follow but equally the same result would occur if the plants are both wet and cold. From March onwards the plant will begin to grow and watering should be increased gradually until late May when the plant should be in full growth. Water regularly during the summer so long as the plant pot is allowed to drain and not sit in a tray of water. During hot weather you may need to water the plants more frequently so long as the plant is actively growing. From late September watering should be reduced to force the plant to go in to a state of semi dormancy, by October you should be back in to the winter watering regime. Keep dry with ample airflow in winter. In the rest period no high atmospheric humidity!! Care must be taken with watering as they tends to become swollen and untidy in growth habit if given too much water and shade.
Fertilization: Feeding may not be necessary at all if the compost is fresh then, feed in summer only if the plant hasn't been repotted recently. Do not feed the plants from September onwards as this can cause lush growth which can be fatal during the darker cold months. .
Hardiness: Grown specimens resist to -4°C for a short time, but it is best to keep above 5° C to avoid ugly spots on the plant epidermis. Some warmth throughout the year will increase the grower's success.
Exposition: Need full sun avoiding only the harshest summer sun, if kept too dark they may become overly lush and greener and could be prone to rotting due to over watering. Tends to bronze in strong light, which encourages flowering and heavy wool and spine production.
Uses: It is an excellent plant for container growing. It always looks good and stays small. It look fine in a cold greenhouse and frame.
Pests & diseases: It may be attractive to a variety of insects, but plants in good condition should be nearly pest-free, particularly if they are grown in a mineral potting-mix, with good exposure and ventilation. Nonetheless, there are several pests to watch for:
- Red spiders: Sensitive to red spider mite. Overhead watering is helpful in controlling mites.
- Mealy bugs: Occasionally mealy bugs they develop aerial into the new growth among the wool with disfiguring results, but the worst types develop underground on the roots and are invisible except by their effects.
- Scales: Scales are rarely a problem.
- Rot: Rot it is only a minor problem with cacti if the plants are watered and “aired” correctly. If they are not, fungicides won't help all that much.
Propagation: Direct sow after last frost. (seldom produces offsets)
Seeds germinate in 7-14 days at 21-27° C in spring, remove the glass cover gradually as the plants develops and keep ventilated, no full sun for young plants! The seedlings should not be disturbed until they are well rooted, after which they can be planted separately in small pots. Cuttings: wait until the offsets that appear at the base of old clustered specimens are 1/3 the size of the parent and then detach and plant. Cuttings will take root in a minimum temperature of 20° C (but better in hot weather). Cuttings of healthy shoots can be taken in the spring and summer. Cut the stem with a sharp, sterile knife, leave the cutting in a warm, dry place for a week or weeks (depending on how thick the cutting is) until a callus forms over the wound. Once the callus forms, the cutting may be inserted in a container filled with firmed cactus potting mix topped with a surface layer of coarse grit. They should be placed in the coarse grit only; this prevents the cut end from becoming too wet and allows the roots to penetrate the rich compost underneath. The cuttings should root in 2 to 6 weeks.
