Origin and Habitat: Entronque El Huizache, San Luis Potosí, México.
Altitude range: Around 1400-1500 metres above sea level.

• Ariocarpus trigonus var. elongatus (Salm-Dyck) Backeb.
• Ariocarpus retusus var. elongatus (Salm-Dyck) Backeb.

• Ariocarpus retusus Scheidw.
• Anhalonium areolosum Lem.
• Anhalonium prismaticum Lem.
• Anhalonium pulvilligerum Lem.
• Anhalonium retusum Salm-Dyck
• Cactus prismaticus Kuntze
• Mammillaria areolosa Hemsl.
• Mammillaria prismatica Hemsl.
• Ariocarpus confusus Halda & Horáček
• Ariocarpus retusus subs. confusus (Halda & Horáček) Lüthy
• Ariocarpus elongatus (Salm-Dyck) Wettst.
• Anhalonium elongatum Salm-Dyck
• Ariocarpus trigonus var. elongatus (Salm-Dyck) Backeb.
• Mammillaria elongata (Salm-Dyck) Hemsl.
• Ariocarpus furfuraceus C.H.Thomps.
• Anhalonium furfuraceum J.M.Coult.
• Ariocarpus retusus var. furfuraceus (S.Watson) G.Frank
• Mammillaria furfuracea S.Watson
• Ariocarpus furfuraceus f. cristata Frič
• Ariocarpus furfuraceus f. monstruosus hort.
• Ariocarpus furfuraceus var. rostratus A.Berger
• Ariocarpus prismaticus hort. ex Cobbold
• Ariocarpus pulvilligerus K.Schum.
• Ariocarpus retusus f. cristata hort.
• Ariocarpus retusus subs. jarmilae Halda, Horáček & Panar.
• Ariocarpus retusus subs. panarottoi Halda & Horáček
• Ariocarpus retusus subs. pectinatus Weisbarth
• Ariocarpus retusus subs. scapharostroides Halda & Horáček
• Ariocarpus retusus var. sladkovskyi Halda & Kupčák
• Ariocarpus retusus subs. sladkovskyi Halda & Kupčák
• Ariocarpus retusus var. elongatus (Salm-Dyck) Backeb.

• Ariocarpus retusus subs. trigonus (F.A.C.Weber) E.F.Anderson & W.A.Fitz Maur.
• Anhalonium trigonum F.A.C.Weber in Bois
• Ariocarpus trigonus (F.A.C.Weber) K.Schum.
• Ariocarpus retusus subs. horacekii Halda & Panar.
• Ariocarpus elongatus subs. horacekii (Halda) Halda
• Ariocarpus trigonus var. horacekii Halda
• Ariocarpus trigonus var. minor M.Voldan

• Ariocarpus retusus cv. Cauliflower
• Ariocarpus retusus cv. Cauliflower King
• Ariocarpus retusus cv. Frumdosus
• Ariocarpus retusus cv. Frumdosus brevituberosus
• Ariocarpus retusus cv. Frumdosus f. variegata
• Ariocarpus retusus cv. Maruibo
• Ariocarpus retusus cv. Maruibo Cauliflower
• Ariocarpus retusus cv. Maruibo Pectinatus
• Ariocarpus retusus cv. Mituibo
• Ariocarpus retusus cv. Three Finger
• Ariocarpus retusus cv. Trefinger
• Ariocarpus retusus cv. Royal Tama Botan
• Ariocarpus retusus cv. Tama Botan
• Ariocarpus furfuraceus cv. Tama Botan
• Ariocarpus retusus f. major

Description: Ariocarpus elongatusSN|2096]]SN|2096]] differs from the standard Ariocarpus retususSN|2079]]SN|2079]] only for its longer and thinner tubercles, all the other characteristics clearly show that they are conspecific.
Taxonomy notes: Ariocarpus retususSN|2096]]SN|2079]] is quite variable and has received numerous unnecessary names of no botanical value, representing no more than local phenotypes: Ariocarpus elongatusSN|2079]]SN|2096]] is one of them. Ariocarpus retususSN|2079]]SN|2079]] is one of the largest species that distinguishes for the fat triangular tubercles forming a starry rosette. It is a widespread and extremely variable plant. Tubercle size and shape vary widely, a terminal areole is sometimes present at the tip. The vast amount of phenotypic variation in the species has led to the erection of several variants and has received numerous unnecessary names of controversial botanical value: Ariocarpus elongatusSN|2096]]SN|2096]] is one of them, but it still has a value for a collector because they identify plants with particular characters.
Habit: Solitary, slow growing geophyte cactus with tubercles slightly projecting above ground level. The flat tuberous body is below the soil.
Stem: Grey, or blue-green, flattened, globose, rounded on top, 3-12 cm high, 10-25 (or more) cm in diameter.
Tubercles: Leaf-like, divergent, becoming attenuate at the apices, not fissured, to 4 cm long, usually 2-2.5 times long than wide.
Areoles: At the tips of the tubercles, rounded, 1-5 mm in diameter only on younger specimens.

Bibliography: Major references and further lectures
1) Edward F. Anderson “The Cactus Family” Timber Press, 2001
2) Curt Backeberg “Cactus Lexicon” Sterling Publishing Company, Incorporated, 1978
3) Hiroshi Hirao “Colour encyclopaedia of cacti” Japan 1979 (Japanese language and script)
4) Willy Cullmann, Erich Götz (Dozent Dr.), Gerhard Gröner “The encyclopedia of cacti” Portland, OR: Timber Press, 1986
5) David Hunt, Nigel Taylor “The New Cactus Lexicon” DH Books, 2006 ISBN 0953813444, 9780953813445
6) 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/Aug./2011

Cultivation and Propagation: This species is slow-growing, but certainly not as slow as some other types of cacti. It is of easy cultivation in a well-drained, non-organic, free-draining soil compost, with ample water during the growing season. Use of a weak low-nitrogen fertilizer during the growing season can encourage growth. The main threat to their development is root rot. Ariocarpus should be kept dry whenever there is a threat of cold. The appearance of Ariocarpus can benefit greatly by watering the plants from the bottom. This practice will help to keep the “wool” on the top of the plant from becoming matted or discoloured. It needs light shade to full sun.
Frost Tolerance: Hardy to -10° C
Propagation: It is probably the easiest species of the genus to raise from seed, but will generally take about 6-10 years to reach flowering size, occasionally grafted.