Origin and Habitat: Mammillaria haageanaSN|20850]]SN|20850]] is widespread and endemic to Mexico, occurring in the States of Puebla, Mexico, Veracruz, Morelos, Tlaxcala, and Oaxaca.
Altitude: 450-2600 metres above sea level.
Habitat and Ecology: The elevation range where this species occurs is wide, therefore it is found in many different vegetation types such as deciduous tropical forest, xerophyllous scrub, oak forest and secondary vegetation, juniper forest, pine forest, lava flows, and often in disturbed areas. It occurs in Cardonal-tetechera. The plants are commonly associated with nurse plants, but can also occur in bare areas. This species is locally threatened by the overcollection of wild populations for use as an ornamental.

• Mammillaria haageana Pfeiff.
• Cactus haageanus (Pfeiff.) Kuntze
• Neomammillaria haageana (Pfeiff.) Britton & Rose

• Mammillaria haageana Pfeiff.
• Cactus haageanus (Pfeiff.) Kuntze
• Neomammillaria haageana (Pfeiff.) Britton & Rose
• Mammillaria albidula Backeb.
• Mammillaria dealbata A.Dietr.
• Cactus dealbatus (A.Dietr.) Kuntze
• Mammillaria elegans var. dealbata (A.Dietr.) Borg
• Neomammillaria dealbata (A.Dietr.) Britton & Rose
• Mammillaria donatii Berge ex K.Schum.
• Neomammillaria donatii (Berge ex K.Schum.) Britton & Rose
• Mammillaria dyckiana Zucc. ex Pfeiff.
• Cactus dyckianus (Zucc.) Kuntze
• Mammillaria kunthii Ehrenb.
• Cactus kunthii (Ehrenb.) Kuntze

• Mammillaria haageana subs. acultzingensis (Lizen et al.) D.R.Hunt
• Mammillaria acultzingensis Lizen et al.

• Mammillaria haageana subs. conspicua (J.A.Purpus) D.R.Hunt
• Mammillaria conspicua J.A.Purpus
• Neomammillaria conspicua (J.A.Purpus) Bravo

• Mammillaria haageana subs. elegans D.R.Hunt
• Mammillaria collina J.A.Purpus
• Mammillaria haageana var. collina (J.A.Purpus) Lizen et al.
• Neomammillaria collina (J.A.Purpus) Britton & Rose

• Mammillaria haageana subs. meissneri (Ehrenb.) U.Guzmán
• Cactus meissneri (Ehrenb.) Kuntze
• Mammillaria acanthophlegma var. meissneri (Ehrenb.) Salm-Dyck
• Mammillaria elegans var. meissneri (Ehrenb.) B.Hofmann
• Mammillaria meissneri Ehrenb.

• Mammillaria haageana subs. san-angelensis (Sánchez-Mej.) D.R.Hunt
• Mammillaria sanangelensis Sánchez-Mej.

• Mammillaria haageana subs. schmollii (R.T.Craig) D.R.Hunt
• Mammillaria elegans var. schmollii R.T.Craig in R.T.Craig
• Mammillaria haageana var. schmollii (R.T.Craig) D.R.Hunt
• Neomammillaria neoelegans var. schmollii (R.T.Craig) Y.Itô

• Mammillaria haageana subs. vaupelii (Tiegel) U.Guzmán
• Mammillaria conspicua var. vaupelii (Tiegel) Repp.
• Mammillaria vaupelii Tiegel
• Neomammillaria vaupelii Y.Itô
• Mammillaria vaupelii var. flavispina W.T.Neale
• Neomammillaria vaupelii var. flavispina (W.T.Neale) Y.Itô

Description: Plants usually solitary, sometimes sprouting at the base or sides when old. Each head is surrounded by a complete ring of starlike pink flowers. There are ample variations among plants from different origin.
Stem: Globularor somewhat elongate in age, glaucous green, up to 15 cm high, (3-)5-10 cm in diameter, apex wolly.
Sap: Without latex (or vaguely milky, whitish-yellowish, but not slimy)
Tubercles: Small, (3-)5-6 mm hight, crowded, conical/pyramidal, four-angled basally.
Axil: Slightly woolly only on new growth, later naked.
Areoles: 2-3 mm, oval, whith white wool when young.
Radial spine: (14-)8-30(-38), smooth, acicular, straight or slightly curved, white, radiating, bristly, 3-6 mm long.
Central spine: usually 2 (but variable from 0 to 6), slender, rigid, straight, not hooked, erect, divergent, black to reddish, turning grey as the ages (3-)6-10(15) mm long. The lower one usually longer
Flower: Deep magenta-pink to pale pink, funnel-shaped, up to 10 mm long, 8-15(-20) mm in diameter. Pericarpel 1,3-2,5 mm long, receptacle-tube 1,3-2,9 mm long, external tepals 2-10 mm long, 1-2 mm wide, linear-lanceolate purple red with a greenish base, internal tepals 6-11 mm long pink to purple with a darker midvein. Filaments whitish or pinkish.
Blooming season: February to April.
Fruit: Red, pinkish at the base, about 1 cm long.
Seed: Brownish.

Bibliography: 1) David Hunt, Nigel Taylor “The New Cactus Lexicon” DH Books, 2006
2) John Pilbeam (1999) “Mammillaria The Cactus File Handbook” Nuffield Press.
3) Edward F. Anderson “The Cactus Family” Timber Press, 2001
4) James Cullen, Sabina G. Knees, H. Suzanne Cubey “The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass”Cambridge University Press, 11/ago/2011
5) Nathaniel Lord Britton, Joseph Nelson Rose “Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family” vol. 4 The Carnegie Institution of Washington, Washington 1923
6) Ulises Guzmán, Salvador Arias, Patricia Dávila: “Catálogo de cactáceas mexicanas.” Universidad Nacional Autónoma de México, Mexiko-State 20038)
7) Florencia Briones, Guadalupe Palomino & Armando Garcia “Chromosome analysis of Mammillaria supertexta, M. crucigera and M. haageana and their comparison with M. san-angelensis (Cactaceae)” in Caryologia: International Journal of Cytology, Cytosystematics and Cytogenetics Volume 57, Issue 3, 2004
8) Hernández, H.M., Cházaro, M. & Gómez-Hinostrosa, C. 2013. Mammillaria haageana. In: IUCN 2013. "IUCN Red List of Threatened Species." Version 2013.2. <www.iucnredlist.org>. Downloaded on 12 January 2014.

Cultivation and Propagation: It is a free-flowering and relatively easy plant to grow.
Exposition: Full sun to light shade.
Watering: Water regularly in summer but do not over-water. Keep dry in winter. Hardy down to -4°C.
Growing tips: It is better that they be repotted regularly. Repotting will increase the number and size of stems, and will increase the number of flowers produced. Repot yearly until it reaches about 3 cm in size, then every two or three years will suffice. Repotting is best done at the end of winter, but it can be done at other time, too. Do not water for a couple of weeks after repotting, in order to reduce risk of root rot via broken roots.
Propagation: Seeds or offsets if available.