Origin and Habitat: Querétaro, San Luis Potosí, Zacatecas.

• Stenocactus phyllacanthus var. violaciflorus

• 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 phyllacanthus var. violaciflorus (Echinofossulocactus phyllacanthusSN|911]]SN|911]] v. violaciflorus) is a controversial variety now referred to Stenocactus phyllacanthusSN|3443]]SN|906]], but also referred to Stenocactus crispatusSN|906]]SN|3443]] and Stenocactus pentacanthus. There is a general lack of understanding on the taxonomic position of the species within the genus and thus is it no possible to define either the spatial or systematic limits of the taxon. The var. violaciflorus mainly distinguishes for the flowers that are slightly larger, more numerous with creamy white petals with pink violet midstripe (not yellow). Whatever they are called they are all lovely plants meriting a place in any succulent collection.

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.