Origin and Habitat: Mammillaria rekoiSN|13403]]SN|13403]] is a widespread and relatively abundant species endemic to the central and northern Oaxaca, Mexico.
Altitude range: It grows at elevations of 700 to 3,000 metres above sea level.
Habitat and Ecology: This cactus grows in oak forest on limestone cliffs, basalt and clay soils. The species appears to be relatively abundant. There are no specific threats to the species although the habitat where it occurs is being degraded by human activities.

• Mammillaria rekoi (Britton & Rose) Vaupel
• Ebnerella rekoi (Britton & Rose) Buxb.
• Mammillaria rekoiana R.T.Craig
• Neomammillaria rekoi Britton & Rose

• Mammillaria rekoi (Britton & Rose) Vaupel
• Ebnerella rekoi (Britton & Rose) Buxb.
• Mammillaria rekoiana R.T.Craig
• Neomammillaria rekoi Britton & Rose
• Mammillaria albrechtiana Wohlschl.
• Mammillaria krasuckae Repp.
• Mammillaria mitlensis Bravo
• Mammillaria pullihamata Repp.
• Mammillaria rekoi var. pseudorekoi (Boed.) R.T.Craig
• Mammillaria pseudorekoi Boed.
• Mammillaria sanjuanensis Repp.

• Mammillaria rekoi subs. aureispina (A.B.Lau) D.R.Hunt
• Mammillaria aureispina (A.B.Lau) Repp.
• Mammillaria rekoi var. aureispina A.B.Lau

• Mammillaria rekoi subs. leptacantha (A.B.Lau) D.R.Hunt
• Mammillaria leptacantha (A.B.Lau) Repp.
• Mammillaria rekoi var. leptacantha A.B.Lau

Description: Mammillaria rekoiSN|13403]]SN|13403]] is a small cactus, that in cultivation starts clustering at about 3 to 5 years old from seed. (while in its natural environment it is simple and rarely branches). Pilbeam (1999) and Hunt et al. (2006) accept two subspecies, namely M. rekoi subsp. rekoi and M. rekoi subsp. aureispina (A.B.Lau) D.R.Hunt. There is also a third subspecies leptacantha (A.B.Lau) D.R.Hunt.
Stems: Globose to short cylindrical, green, 12-15 cm high, 5 - 6 cm in diameter. Sometimes with latex.
Tubercles: Conical to cylindrical. (Tubercle arrangement: 8-13 ) Axil with short white wool and white bristles.
Areoles: Woolly when young.
Radial spines: About 20(-30), radiating, finely bristly, needle-like, white to golden yellow, 4 - 6 mm long.
Central spines: 4(-7), much stouter than the radials, yellow, amber or brown, hooked or sometimes straight, 10 - 15 mm long, the lower one sometimes strongly hooked.
Flowers: Deep purple pink to pink, with darker midribs, up to 15 mm long, stigmas greenish. The petals flare back at the ends, rather than opening widely.
Blooming season: Spring.
Fruits: Red.
Seeds: Brown.

Bibliography: Major references and further lectures
1) John Pilbeam (1999) “Mammillaria The Cactus File Handbook” Nuffield Press.
2) Edward F. Anderson “The Cactus Family” Timber Press, 2001
3) Hernández, H.M. & Arias, S. 2013. Mammillaria rekoi. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 20 May 2015.

Cultivation and Propagation: Mammillaria rekoiSN|13403]]SN|13403]] requires excellent drainage provided by porous cactus soil. Easily clustering, it's an easy bloomer.
Growth rate: Most plants will offset readily, and clumps can be produced in a few years.
Repotting: We suggest repotting every 2-3 years.
Fertilization: During the beautiful season enrich the soil using a fertilizer rich in potassium and phosphorous, but poor in nitrogen, because this chemical element doesn’t help the development of succulent plants, making them too soft and full of water.
Exposure: It prefers bright light and ample airflow. Outside full sun or afternoon shade, inside it needs bright light, and some direct sun.
Moisture: Water the soil abundantly when it is dry to the touch. Allow soil to drain thoroughly before watering again. Do not water much in the winter (rot prone). Overwintering: Protect from frost. But it's hardy to -5°C if kept dry.
Propagation: Division, direct sow after last frost.