Origin and Habitat: Hidalgo, San Luis Potosí, Querétaro, Mexico
Altitude: 1500-2500
Habitat: It grows in the Mattoral xerophilo, pastizal and open juniper-pinion forests. These areas support succulents and xerophytes plants such as Opuntia robusta, Opuntia streptacantha, Opuntia tunicata, Opuntia scheeri, Ferocactus histrixSN|4259]]SN|4300]], Ferocactus latispinusSN|4300]]SN|4259]], Thelocactus bicolorSN|3420]]SN|3420]], Echinocereus cinerascensSN|7775]]SN|7775]], Parkinsonia aculeata, Myrtillocactus geometrizansSN|8050]]SN|8050]], Coryphantha erectaSN|3914]]SN|3941]], Coryphantha radiansSN|3941]]SN|3914]], Acacia farinosa, Ipomoea arborescens, Echinocactus platyacanthusSN|1711]]SN|10367]], Echinocactus horizonthaloniusSN|10367]]SN|1711]], Larrea tridentata, Echeveria secundaSN|27133]]SN|27133]] and Dasylirion acrotichum.

• Stenocactus dichroacanthus (Mart. ex Pfeiff.) A.Berger ex Backeb. & F.M.Knuth
• Brittonrosea dichroacantha (Mart. ex Pfeiff.) Speg.
• Echinocactus dichroacanthus Mart. ex Pfeiff.
• Echinocactus dichroacanthus spinosior Monv. in Labour.
• Echinofossulocactus crispatus f. dichroacanthus (Mart.) P.V.Heath
• Echinofossulocactus dichroacanthus (Mart. ex Pfeiff.) Britton & Rose
• Efossus dichroacanthus (Mart. ex Pfeiff.) Orcutt

• Stenocactus crispatus (DC.) A.Berger
• Brittonia crispata (DC.) Speg.
• Brittonrosea crispata (DC.) Speg.
• Echinocactus crispatus DC.
• Echinocactus undulatus A.Dietr.
• Echinofossulocactus crispatus (DC.) Lawr. in Loudon
• Efossus crispatus (DC.) Orcutt
• Ferocactus crispatus (DC.) N.P.Taylor
• Stenocactus acroacanthus (D.C.Stieber) W.T.Marshall & T.M.Bock
• Echinocactus acroacanthus D.C.Stieber
• Echinofossulocactus acroacanthus (D.C.Stieber) G.D.Rowley
• Echinofossulocactus crispatus f. acroacanthus (D.C.Stieber) P.V.Heath
• Stenocactus anfractuosus (Mart. ex Pfeiff.) A.Berger
• Brittonrosea anfractuosa Speg.
• Echinocactus anfractuosus Mart. ex Pfeiff.
• Echinofossulocactus anfractuosus (Mart. ex Pfeiff.) Lawr. in Loudon
• Echinofossulocactus crispatus f. anfractuosus (Pfeiff.) P.V.Heath
• Efossus anfractuosus Orcutt
• Stenocactus arrigens (Link ex A.Dietr.) A.Berger
• Brittonrosea arrigens Speg.
• Echinocactus arrigens Link ex A.Dietr.
• Echinofossulocactus arrigens (Link ex A.Dietr.) Britton & Rose
• Echinofossulocactus crispatus f. arrigens (Link ex A.Dietr.) P.V.Heath
• Echinofossulocactus obvallatus var. arrigens (Link ex A.Dietr.) J.Meyran
• Efossus arrigens (Link ex A.Dietr.) Orcutt
• Stenocactus arrigens f. cristatus hort.
• Echinofossulocactus arrigens f. cristatus hort.
• Stenocactus confusus (Britton & Rose) F.M.Knuth in Backeb. & F.M.Knuth
• Brittonrosea confusa Speg.
• Echinofossulocactus confusus Britton & Rose
• Echinofossulocactus crispatus f. confusus (Britton & Rose) P.V.Heath
• Efossus confusus (Britton & Rose) Orcutt
• Stenocactus crispatus f. cristatus hort.
• Echinofossulocactus crispatus f. cristatus hort.
• Stenocactus crispatus f. ensiferus (Lem.)
• Echinocactus anfractuosus var. ensiferus (Lem.) Salm-Dyck
• Echinocactus ensiferus Lem.
• Echinofossulocactus crispatus f. ensiferus (Lem.) P.V.Heath
• Stenocactus crispatus f. undulatus (A.Dietr.)
• Echinofossulocactus crispatus f. undulatus (A.Dietr.) P.V.Heath
• Stenocactus dichroacanthus (Mart. ex Pfeiff.) A.Berger ex Backeb. & F.M.Knuth
• Brittonrosea dichroacantha (Mart. ex Pfeiff.) Speg.
• Echinocactus dichroacanthus Mart. ex Pfeiff.
• Echinocactus dichroacanthus spinosior Monv. in Labour.
• Echinofossulocactus crispatus f. dichroacanthus (Mart.) P.V.Heath
• Echinofossulocactus dichroacanthus (Mart. ex Pfeiff.) Britton & Rose
• Efossus dichroacanthus (Mart. ex Pfeiff.) Orcutt
• Stenocactus fasciculatus hort.
• Echinofossulocactus fasciculatus
• Stenocactus flexispinus hort.
• Echinocactus flexispinus Salm-Dyck non Engelm.
• Echinofossulocactus crispatus f. flexispinus (Salm-Dyck) P.V.Heath
• Echinofossulocactus flexispinus (Salm-Dyck) Bravo
• Stenocactus gladiatus (Link & Otto) A.Berger ex Backeb. & F.M.Knuth
• Brittonrosea gladiata (Link & Otto) Speg.
• Echinocactus gladiatus Link & Otto
• Echinocactus gladiatus intermedius Lem. in Labour.
• Echinocactus gladiatus ruficeps Lem. in Labour.
• Echinofossulocactus gladiatus (Link & Otto) Lawr. in Loudon
• Efossus gladiatus (Link & Otto) Orcutt
• Melocactus gladiatus Link & Otto
• Stenocactus grandicornis (Lem.) A.Berger ex Backeb. & F.M.Knuth
• Brittonrosea grandicornis (Lem.) Speg.
• Echinocactus grandicornis Lem.
• Echinocactus grandicornis var. fulvispinus Salm-Dyck
• Echinofossulocactus crispatus f. grandicornis (Lem.) P.V.Heath
• Echinofossulocactus grandicornis (Lem.) Britton & Rose
• Efossus grandicornis (Lem.) Orcutt
• Stenocactus phyllacanthus f. grandicornus hort.
• Stenocactus guerraianus f. cristatus
• Echinofossulocactus guerraianus f. cristatus
• Stenocactus hastatus (Hopffer ex K.Schum.) A.Berger
• Brittonrosea hastata (Hopffer ex K.Schum.) Speg.
• Echinofossulocactus hastatus (Hopffer ex K.Schum.) Britton & Rose
• Echinofossulocactus sulphureus f. hastatus (Hopffer ex K.Schum.) P.V.Heath
• Efossus hastatus (Hopffer ex K.Schum.) Orcutt
• Stenocactus lamellosus hastatus hort.
• Stenocactus kellerianus hort.
• Echinofossulocactus crispatus f. kellerianus (Krainz) P.V.Heath
• Echinofossulocactus kellerianus Krainz
• Stenocactus lamellosus (A.Dietr.) A.Berger
• Brittonrosea lamellosa (A.Dietr.) Speg.
• Echinocactus lamellosus A.Dietr.
• Echinocactus lamellosus var. fulvescens Salm-Dyck
• Echinofossulocactus crispatus f. lamellosus (A.Dietr.) P.V.Heath
• Echinofossulocactus lamellosus (A.Dietr.) Britton & Rose
• Efossus lamellosus (A.Dietr.) Orcutt
• Stenocactus lancifer (A.Dietr.) A.Berger ex Backeb. & F.M.Knuth
• Brittonrosea lancifera (A.Dietr.) Speg.
• Echinocactus lancifer A.Dietr.
• Echinofossulocactus crispatus f. lancifer (A.Dietr.) P.V.Heath
• Echinofossulocactus lancifer (A.Dietr.) Britton & Rose
• Efossus lancifer (A.Dietr.) Orcutt
• Stenocactus longispinus hort.
• Echinofossulocactus arrigens var. longispinus (Pechanek) hort.
• Echinofossulocactus dichroacanthus var. longispinus (Pechanek) hort.
• Echinofossulocactus longispinus Pechanek
• Stenocactus crispatus f. longispinus hort.
• Stenocactus multiareolatus Bravo
• Echinofossulocactus multiareolatus Bravo
• Stenocactus violaciflorus (Quehl) A.Berger
• Brittonrosea violaciflora (Quehl) Speg.
• Echinocactus violaciflorus Quehl
• Echinofossulocactus crispatus f. violaciflorus (Quehl) P.V.Heath
• Echinofossulocactus violaciflorus (Quehl) Britton & Rose
• Efossus violaciflorus (Quehl) Orcutt
• Stenocactus dichroacanthus subs. violaciflorus (Quehl) U.Guzmán & Vázq.-Ben.
• Stenocactus dichroacanthus var. violaciflorus (Quehl) Bravo
• Stenocactus xiphacanthus (Miq.) hort., nov. comb. ined.
• Echinocactus xiphacanthus Miq.
• Echinofossulocactus xiphacanthus (Miq.) Backeb.

Description: Stenocactus dichroacanthusSN|6251]]SN|6251]] is one of the many geographical form of the widespread and morphologically very variable Stenocactus crispatusSN|3443]]SN|3443]]. Many of its morphological and geographical variant was early classified as different independent species, but nowadays all this plant are considered part of a multiform species, where each form is linked to others by populations of plants with intermediate characteristics. Stenocactus dichroacanthusSN|6251]]SN|6251]] typically has 3 strong flattened central spines and 4-6 glassy-white radial spines.
Habit: It is a solitary plant (or rarely branching).
Stem: Obovoid up to 15 cm tall, 10 cm wide, somewhat umbilicated at apex, yellowish green, bluish-green, dark matt green or dark olive-green.
Ribs: (25-)30-60(-80) thin, acute, very regularly and attractively waived and depressed in the region of areoles. The flattened, wavy or curled ridges of this species are characteristic of other kinds of Echinofossulocactus.
Areoles: Only a few in each ribs, white tomentose in youth, later naked.
Radial spines: Usually 4 to 6 flattened, whitish to brownish, 0,5 to 1 cm long and about 0,6-1 mm wide at the base.
Central spine: 2-3 very flattened, purplish, directed upwards, ferocious-looking, straight or curved, unequal with one very long.
Radial spines: 4 to 6 glassy-white.
Flowers: Several at a time at plants apex, rather small, 2-4 cm long, funnel-shaped. Perianth segments in two series, pale pink with a purplish midrib, oblong-linear, acute. Flower tube well developed, covered with imbricating scales.
Blooming season: Late spring to summer.
Fruits: 8-12 mm long, 4-6 mm wide, obovoid reddish to greysh, dry at maturity.

Notes: Identifying the species of a Stenocactus (Echinofossulocactus) is as difficult as identifying the genus is easy. For the most part, they tend to look alike, and there are far more names than there are species.

Bibliography: Major references and further lectures
1) Nigel Paul Taylor "A commentary on the genus Echinofossulocactus Lawr." In: Cactus and Succulent Journal of Great Britain. Volume 41, page 35–42 1979
2) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
3) 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
4) David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006
5) Hans Hecht “Cacti & succulents” Sterling Pub. Co., 1997
6) Walther Haage "Kakteen von A bis Z" , Quelle & Meyer Verlag: Heidelberg, 1986
7) Urs Eggli "Das große Kakteen-Lexikon" Ulmer, Stuttgart 2005
8) David Hunt "CITES Cactaceae Checklist" Second Edition. 1999
9) Innes C, Wall B. "Cacti, Succulents and Bromeliads" Cassell & The Royal Horticultural Society. 1995
10) Backeberg C. "Die Cactaceae" Volume-6, Jena 1963
11) Backeberg C. "Das Kakteenlexikon" Jena 1966
12) Rauh W. " Kakteen an ihren Standorten", Berlin-Hamburg, 1979

Cultivation and Propagation: Stenocactus dochroacanthus is easy to to care cactus, recommended for any collection that needs lots of light with ample airflow.
Growth rate: It is small growing and easy to to care and very willing to flower. Because of it’s small size makes a great potted plant specimen, great for beginning collectors.
Soils: It needs regular cacti soil with little organic matter (peat, humus). Good drainage is essential along with good moisture retention properties and adequate nutrients availability.
Repotting: Repotting every other year. As it is especially prone to rot under-pot in a smaller container filled with very porous compost. Use pot with good drainage.
Watering: No absolute schedule can be given for watering as various factors (Soil mixture, containers, drainage, temperature, size of plant) influence water use, so - as a general rule - the soil should be thoroughly wetted at each watering during the active growing season (spring and summer), water when the top 1,5- 2 cm of soil feels dry to the finger. Do not soak the soil during the dormant period. Be careful, excessive watering can make root and/or stem to rots. Make sure there is good air circulation between plants. 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: During the growing 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.
Hardiness: Reputedly sensitive to frost , but less so if kept on the dry side prior to, and during, cold weather (hardy to -5° C for short periods). However some warmth throughout the year will increase the grower's success (minimum 5° C during rest season). These cool temperatures develop sturdier plants and encourage the formation of flower buds.
Exposition: Outside bright sun it likes strong sunshine, but is tolerant and do well with light shade during the hot Summer months, inside it needs bright light, and some direct sun. Subject to sunburn if exposed to direct sun for too long. 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: Seeds (usually) or by the shoots of adult plants (if available). 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 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). This permits the cut surface to heal, or callus. The callus helps prevent rotting when the cutting is placed in the rooting material. 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.