Origin and Habitat: Stenocactus phyllacanthusSN|906]]SN|906]] is endemic to Mexico, occurring in the states of Aguascalientes, Guanajuato, Hidalgo, Jalisco, Nuevo León, Querétaro, San Luis Potosí, Zacatecas.
Altitude range: It grows at elevations of 1700-2800 metres above sea level.
Habitat and ecology: This species occurs in desert scrub where it grows and hides in high grass, and the spines that looks like dried grass leaves, make the plants almost invisible in their natural environment.

• Stenocactus phyllacanthus (A.Dietr. & Otto) A.Berger
• Brittonrosea phyllacantha (A.Dietr. & Otto) Speg.
• Echinocactus phyllacanthus A.Dietr. & Otto
• Echinofossulocactus phyllacanthus Lawr. in Loudon
• Efossus phyllacanthus (A.Dietr. & Otto) Orcutt
• Ferocactus phyllacanthus (A.Dietr. & Otto) N.P.Taylor

• Stenocactus phyllacanthus (A.Dietr. & Otto) A.Berger
• Brittonrosea phyllacantha (A.Dietr. & Otto) Speg.
• Echinocactus phyllacanthus A.Dietr. & Otto
• Echinofossulocactus phyllacanthus Lawr. in Loudon
• Efossus phyllacanthus (A.Dietr. & Otto) Orcutt
• Ferocactus phyllacanthus (A.Dietr. & Otto) N.P.Taylor
• Stenocactus phyllacanthus var. macracanthus (Lawr.)
• Echinofossulocactus phyllacanthus var. macracanthus Lawr.
• Stenocactus phyllacanthus var. violaciflorus
• Stenocactus tricuspidatus (Scheidw.) A.Berger ex Backeb. & F.M.Knuth
• Echinocactus phyllacanthus var. tricuspidatus (Scheidw.) Förster
• Echinocactus tricuspidatus Scheidw.
• Echinofossulocactus tricuspidatus Britton & Rose
• Efossus tricuspidatus Orcutt

Description: Stenocactus phyllacanthusSN|906]]SN|906]], best known as Echinofossulocactus phyllacanthusSN|911]]SN|911]], is a round cactus with the upper central spines three-pronged long, flattened grass-like and numerous wavy ribs, it is distinguished from similar wavy ribbed species by its small yellowish flowers and few radial spines. Older plants sometimes get corky near the base. There is a general lack of understanding on the taxonomic position of this species within the genus and thus is it no possible to define either the spatial or systematic limits of the taxon. There is much variation within the current taxon, and most of the "phyllacanthus" - especially those with pink o violet striped flowers - may correspond to other species.
Stems: Usually solitary, occasionally few branched, depressed globose to short cylindrical, dull green or dark bluish green, flat or somewhat depressed apically, 3 to 15 cm. high, 4-10 cm in diameter.
Ribs: (25-)30 to 35(-60), very thin, strongly undulate.
Areoles: Only a few to a rib (mostly 1-2), white-tomentose when young.
Spines: Shorter and less dense than in other species the main one broad and flattened.
Central spines: 1-3, lance shaped, reddish at first, becoming brownish or grey, 30-80 mm long, upper one, or rarely 2 spines, much elongated, erect or connivent over the top of the plant,
flattened, thin, somewhat annulate.
Radial spines: 2-7, straight, weak-subulate, white, bristly or awl shaped, and
spreading 4-9 mm long.
Flowers: Born singly or 2-3 together, produced sporadically all-through spring and summer, yellowish white with brownish red throats, 15 to 20 mm long. Tube short. Inner perianth-segments acute.
Fruits: Small, green.
Remarks: Stenocactus tricuspidatusSN|912]]SN|912]] (a multiheaded species) has been moved into Stenocactus phyllacanthusSN|906]]SN|906]] in the most recent revisions.

Bibliography: Major references and further lectures
1) Gómez-Hinostrosa, C., Sánchez , E., Guadalupe Martínez, J. & Bárcenas Luna, R. 2013. Stenocactus phyllacanthus. The IUCN Red List of Threatened Species. Version 2015.1. <www.iucnredlist.org>. Downloaded on 02 June 2015.
2) Graham Charles “Cacti and Succulents: An illustrated guide to the plants and their cultivation” Crowood, 30 April 2014
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 Hunt, Nigel Taylor “The New Cactus Lexicon” DH Books, 2006 ISBN 0953813444, 9780953813445.
5) Edward F. Anderson “The Cactus Family” Timber Press, 2001
6) Nathaniel Lord Britton, Joseph Nelson Rose “The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family” Volume 3, 1922
7) Willy Cullmann; Gerhard Groner; Erich Gotz “The Encyclopedia of Cacti” Alpha Books 1986

Cultivation and Propagation: Easy to to care and flower. 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. Good drainage is essential along good moisture retention properties and adequate nutrients availability. Require bright sunlight to grow well. Dormant plants do best at temperatures from 5-10°C (but will tolerate -5° for short periods). The cooler temperatures develop sturdier plants and encourage the formation of flower buds.
Pests: The narrow ribs, the wooly areoles, and the dense spines are an ideal habitat for mealy bugs. Frequent inspection of the plants will prevent them from spreading.