• Echinocereus aguirrei Glass
• Echinocereus amoenus var. aguirre hort.
• Echinocereus pulchellus var. amoenus f. aguirrei (Glass)

• Echinocereus pulchellus (Mart.) C.F.Först. ex F.Seitz
• Cereus pulchellus Pfeiff.
• Echinocactus pulchellus Mart.
• Echinonyctanthus pulchellus Lem.
• Echinopsis pulchella Zucc. ex Förster
• Echinocereus aguirrei Glass
• Echinocereus amoenus var. aguirre hort.
• Echinocereus pulchellus var. amoenus f. aguirrei (Glass)
• Echinocereus pulchellus var. amoenus (A.Dietr.) H.P.Kelsey & Dayton
• Cereus amoenus (A.Dietr.) Hemsl.
• Echinocereus amoenus (A.Dietr.) K.Schum.
• Echinocereus pulchellus subs. amoenus (A.Dietr.) W.Blum
• Echinopsis amoena A.Dietr.
• Echinopsis pulchella var. amoena (A.Dietr.) Förster
• Echinopsis pulchella var. flore kermesina Haage ex Förster
• Echinopsis pulchella var. rosea Labour.
• Echinocereus pulchellus subs. venustus W.Blum & W.Rischer

• Echinocereus pulchellus subs. acanthosetus (S.Arias & U.Guzmán) N.P.Taylor
• Echinocereus pulchellus var. acanthosetus S.Arias & U.Guzmán

• Echinocereus pulchellus subs. sharpii (N.P.Taylor) N.P.Taylor
• Echinocereus pulchellus var. sharpii N.P.Taylor

• Echinocereus pulchellus subs. weinbergii (Weing.) N.P.Taylor
• Echinocereus pulchellus var. weinbergii (Weing.) N.P.Taylor
• Echinocereus weinbergii Weing.

Description: Echinocereus aguirreiSN|8591]]SN|8598]] is one of the several forms of the very variable Echinocereus pulchellusSN|8598]]SN|8588]] which form a complex of related taxon. It is still unclear whether this variable complex is one or several species. There is so much variation that most authors choose to lump them together. Echinocereus aguirreiSN|8588]]SN|8598]] typically forms small clumps and produces great pink flower and is very similar to Echinocereus amoenusSN|8598]]SN|8591]] and the two are frequently confused. The 'aguirrei' form differs from subspecies 'pulchellus' in that the stems are not so crunched against each other, they’re a bit taller, and the tubercles stand out more. The body colour is also different, being a lighter green to grey green, tending toward bluish on some individuals.  
Habit: Solitary or slowly clumping, often shrinking into the ground during drought.
Roots: It has a strong taproot.
Stems: Flat globular up to 6 cm (but cultivated plants are frequently higher), 5-7 cm in diameter, bluish green when young;
Ribs: 9 to 13;
Areoles: 5 to7 mm inch apart; 3 to 7 pale yellowish spines.
Flowers: Abundant pink or purple/red (rarely white) flowers, up to 6 cm in diameter.
Blooming season: Spring. Plants start flowering when only few centimeter in diameter.
Fruits: Globose, small, nearly dry at maturity, with few seeds.

Bibliography: Major references and further lectures
1) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
2) 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
3) David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006
4) Nathaniel Lord Britton, Joseph Nelson Rose “Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family” Courier Dover Publications, 1963
5) Cactus and Succulent Journal - Volume 80, 1-6 2008 - Page 132

Cultivation and Propagation: It is relatively easy to grow on its own roots.
Growth rate: It is a relatively slow growing and easily flowering species that will make clumps given the best conditions.
Soils: It likes very porous standard cactus mix soil.
Repotting: It has a strong tap root and should have a deep pot to accommodate it. Use pot with good drainage.
Watering: Water carefully, too much water will make it rot, keep dry in winter.
Fertilization: Feed with a high potassium fertilizer in summer.
Hardiness: Keep dry at minimum temperature of 5° C in winter although will tolerate brief periods to -10 degrees. Sun Exposure: Full sun to light shade. However warmth throughout the year will increase the grower's success (5-12°C during rest season).
Exposition: Outside full sun to light shade or afternoon shade, 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.
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 or outdoor in a rockery.
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: Red spiders may be effectively rubbed up by watering the plants from above.
- Mealy bugs: Mealy bugs occasionally 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 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: It grow easily from seed or cutting (if available).