Origin and Habitat: Echinofossulocactus tricuspidatusSN|914]]SN|914]] (Scheidweiler) Britton et Rose 1922
Habitat: This species 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 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

• 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: Habit: It is a multiheaded species distinguished for the small sized yellowish blooms, very short flattened foliaceous central spines and few radial spines.
Stem: Round to shortly cylindrical, apex flat or slightly depressed, up to 10 cm in diameter (but usually smaller) the epidermis is dark bluish-green. Older plants sometimes get corky near the base.
Ribs: Numerous,25-40(-55) wavy, thin .
Areoles: Well spaded (only 1 or 2 per ribs) Initially woolly, afterwards naked.
Spines: Typically 5.
Central spines: 3 short in the upper part of the areoles, lanceolate, straight or recurved 1-3 cm long, somewhat anulate, reddish to amber coloured (sometime with a darker tip) that becomes whitish as they ages. The upper one is very flat and sometime three-toothed at apex.
Radial spines: 2 (occasionally more), appressed, in the bottom of the areole, awl shaped pointing downward, much shorter than the upper ones, up to 1 cm long.
Flowers: Abundant up to 1,5 cm long, cream or yellowish-white often with darker reddish or brownish throat. Scales on the ovary ovate.
Fruits: Greenish, small.

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.