Origin and Habitat: Pinchas, Argentina.
Altitude: 2400-2600 metres over sea level.

• Echinopsis hyalacantha (Speg.) Werderm.
• Acanthocalycium hyalacanthum (Speg.) Backeb. in Backeb. & F.M.Knuth
• Helianthocereus hyalacanthus (Speg.) Backeb.
• Lobivia formosa var. hyalacantha (Speg.) Rausch
• Lobivia hyalacantha Speg.

• Echinopsis huascha (F.A.C.Weber) H.Friedrich & G.D.Rowley
• Cereus huascha F.A.C.Weber
• Helianthocereus huascha (F.A.C.Weber) Backeb.
• Lobivia huascha (F.A.C.Weber) W.T.Marshall
• Salpingolobivia huascha (F.A.C.Weber) Y.Itô
• Trichocereus huascha (F.A.C.Weber) Britton & Rose
• Echinopsis huascha var. andalgalensis (F.A.C.Weber)
• Cereus andalgalensis F.A.C.Weber ex K.Schum.
• Helianthocereus andalgalensis (F.A.C.Weber ex K.Schum.) Backeb.
• Lobivia andalgalensis (F.A.C.Weber ex K.Schum.) Britton & Rose
• Lobivia huascha var. andalgalensis (F.A.C.Weber ex K.Schum.) Rausch
• Salpingolobivia andalgalensis (F.A.C.Weber ex K.Schum.) Y.Itô
• Trichocereus andalgalensis (F.A.C.Weber ex K.Schum.) Hosseus
• Echinopsis huascha var. auricolor (Backeb.) H.Friedrich & G.D.Rowley
• Helianthocereus huascha var. auricolor (Backeb.) Backeb.
• Trichocereus andalgalensis var. auricolor (Backeb.) F.Ritter
• Trichocereus auricolor Backeb. in Backeb. & F.M.Knuth
• Echinopsis huascha var. calliantha (F.Ritter)
• Lobivia huascha var. calliantha (F.Ritter) Rausch
• Trichocereus callianthus F.Ritter
• Echinopsis huascha var. catamarcensis (F.Ritter)
• Trichocereus catamarcensis F.Ritter
• Echinopsis huascha var. flaviflora (F.A.C.Weber)
• Cereus huascha var. flaviflora F.A.C.Weber
• Lobivia shaferi var. flaviflora (Speg.) E.Herzog
• Trichocereus huascha var. flaviflorus (F.A.C.Weber) Hosseus
• Echinopsis huascha var. grandiflora (Britton & Rose)
• Chamaecereus grandiflorus Frič
• Helianthocereus grandiflorus (Britton & Rose) Backeb.
• Lobivia grandiflora Britton & Rose
• Lobivia huascha var. grandiflora (Britton & Rose) Rausch
• Trichocereus grandiflorus (Britton & Rose) Backeb.
• Echinopsis huascha var. grandiflora f. herzogii (Rausch)
• Lobivia grandiflora var. herzogii Rausch
• Echinopsis huascha var. grandiflora f. longispina (Rausch)
• Lobivia grandiflora var. longispina Rausch
• Echinopsis huascha var. grandiflora f. pumila (Rausch)
• Lobivia grandiflora var. pumila Rausch
• Echinopsis huascha var. macrantha (Backeb.)
• Echinopsis huascha var. purpureominiata (F.Ritter)
• Hymenolobivia purpureominiata F.Ritter
• Lobivia huascha var. purpureominiata (F.Ritter) Rausch
• Lobivia purpureominiata F.Ritter
• Trichocereus lobivioides f. purpureominiata
• Echinopsis huascha subs. robusta (Rausch) M.Lowry
• Lobivia huascha var. robusta Rausch
• Echinopsis huascha var. rosiflora (Y.Itô)
• Soehrensia huascha var. rosiflora Y.Itô
• Echinopsis huascha var. rubriflora (F.A.C.Weber) H.Friedrich & G.D.Rowley
• Cereus huascha var. rubriflorus F.A.C.Weber
• Helianthocereus huascha var. rubriflorus (F.A.C.Weber) Backeb.
• Lobivia huascha var. rubriflora (F.A.C.Weber) G.D.Rowley
• Echinopsis hyalacantha (Speg.) Werderm.
• Acanthocalycium hyalacanthum (Speg.) Backeb. in Backeb. & F.M.Knuth
• Helianthocereus hyalacanthus (Speg.) Backeb.
• Lobivia formosa var. hyalacantha (Speg.) Rausch
• Lobivia hyalacantha Speg.
• Echinopsis pecheretiana (Backeb.) H.Friedrich & G.D.Rowley
• Helianthocereus pecheretianus Backeb.
• Trichocereus huascha var. pecheretianus (Backeb.) R.Kiesling
• Echinopsis pecheretiana var. viridior (Backeb.)
• Helianthocereus pecheretianus var. viridior Backeb.
• Echinopsis purpureominiata (F.Ritter)
• Echinopsis rowleyi H.Friedrich
• Lobivia rowleyi Y.Itô
• Trichocereus rowleyi (H.Friedrich) R.Kiesling
• Echinopsis rowleyi var. longispina (Y.Itô)
• Lobivia rowleyi var. longispina Y.Itô
• Echinopsis rowleyi var. rubraurantiaca (Y.Itô)
• Lobivia rowleyi var. rubraurantiaca Y.Itô

Description: Echinopsis hyalacanthaSN|1026]]SN|61]] (more often listed under its old name Lobivia hyalacanthaSN|63]]SN|63]]) is a controversial geographical or morphological form of the very variable Echinopsis huaschaSN|61]]SN|1026]] with a solid and spiny presence and big yellow flowers. The dense brown spines would protect them from the extremes of cold and sunshine. The new spines are actually dark brown and appear in the spring.
Habit: Solitary at first, later forming low clumps with few to several upright or sprawling, stems.
Stem: Cylindrical, stout, light green, branching from the base.
Ribs: 14-17 vertical, symmetrical, obtuse, low and rounded.
Areoles: Whitish or brownish more or less approximate, 5-10 mm apart.
Spines: Stout, needle-like, spreading, straight or slightly curved, reddish brown, up to 6 (or more)cm long.
Flowers: Fire yellow, funnel-shaped, diurnal, originating in the apical zone and are about 6-9 cm long and broad. Pericarpel and floral tubes with dense scales bearing long brown hairs.
Blooming period: Open in the day in the spring.
Fruits: Globose to ovoid, yellowish green or reddish.

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) Friedrich Ritter "Kakteen in Südamerika: Ergebnisse meiner 20jährigen" Volume 2, Argentinien/Bolivien, Volume 2 Selbstverlag, 1980
5) Curt Backeberg “Die Cactaceae: Handbuch der Kakteenkunde,” Volume 2 G. Fischer, 1959
6) N. L. Britton and J. N. Rose “The 'Cactaceae', Descriptions and Illustrations of Plants of the 'Cactus' Family” volume 2 Carnegie Institution, 1920
7) Gordon Douglas Rowley "Reunion of the genus Echinopsis”. In: IOS Bulletin. Journal of the International Organization for Succulent Plant Study. Volume 3, Nuber 3, page 94 , 1974
8) Perea, M., Trevisson, M. & Demaio, P. 2013. Echinopsis huascha. In: IUCN 2013. "IUCN Red List of Threatened Species." Version 2013.1. <www.iucnredlist.org>. Downloaded on 01 November 2013.
9) John Borg "Cacti: a gardener's handbook for their identification and cultivation" Blandford P., 1970
10) Walther Haage: "Kakteen von A bis Z." Quelle & Meyer Verlag, Heidelberg 1986
11) Urs Eggli, Leonard E. Newton: "Etymological Dictionary of Succulent Plant Names." Birkhäuser 2004

Cultivation and Propagation: Echinopsis huaschaSN|1026]]SN|1026]] (and its forms and varieties) is very easy to grow and cold hardy as low as -7°C (or less).
Growth rate This species produces noticeable amounts of growth each year if kept well fed and watered throughout the warmest months, particularly if it has been acclimatised to accept full sun. Once this cactus is established it can easily produce 10 cm of growth every year. Plants grown in the ground form soon imposing specimens.
Sun Exposure: Outside full sun, inside needs bright light, and some direct sun. During winter month, put them in a cool luminous place and encourage them to enter winter dormancy by withholding water and fertiliser over the winter as they will etiolate, or become thin, due to lower levels of light.
Soils: It needs a fertile, well drained soil mix.
Waterings: Water the plants well and allow them to dry before watering again. This species seems to do better with a little more water than most cacti. In fact, its cultivation requirements are really more like 'normal' plants than most other cacti.
Fertilization: During the growing season fertilize them monthly with a balanced fertilizer.
Pest and diseases: They are susceptible to fungal diseases if overwatered, but are not nearly as sensitive as many other cacti, especially in warm weather. They tend characteristically towards black rotted spots unless watering is moderate and only in hot weather, if kept damp through cold periods, they will invariably suffer.
Propagation: Cutting or from seed. The seeds are quite easy to germinate and grow. Their main requirements consist of high humidity levels, free-draining soil mix, and enough water, light, and nutrition. The flower colour is not always true from seeds.