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{{Taxobox
{{Taxobox
| name = Acanthocalycium
| name = Acanthocalycium
| image = Acanthocalycium.jpg
| image = Acanthocalycium_spiniflorum.jpg
| kingdom = [[Plantae]]
| kingdom = [[Plantae]]
| family = [[Cactaceae]]
| family = [[Cactaceae]]
| subfamily = [[Cactoideae]]
| subfamily = [[Cactoideae]]
| tribe = [[Trichocereeae]]
| tribe = [[Cereeae]]
| subtribe = [[Trichocereinae]]
| subtribe = [[Trichocereinae]]
| genus = '''Acanthocalycium'''
| genus = '''Acanthocalycium'''
| notes = Taxonomy follows Joël Lodé (2015–2019).
| authority = Backeberg (1936)
| notes = Taxonomy follows Joël Lodé (2015) with molecular insights from Arakaki (2003), Bárcenas et al. (2011), Hernández-Hernández et al. (2011), and Schlumpberger & Renner (2012).
}}
}}


== Etymology ==
== Etymology ==
The name ''Acanthocalycium'' derives from the Greek ''akantha'' (spine) and ''kalyx'' (calyx), referring to the spiny floral tubes characteristic of the genus.
The name ''Acanthocalycium'' means “spiny calyx”, referring to the floral tube covered with spiny scales.


== Description ==
== Description ==
'''Acanthocalycium''' is a genus of usually solitary cacti with globose to slightly elongated stems and often a depressed apex. Ribs are acute and may be tuberculate. Spines are generally straight, acicular to subulate.
'''Acanthocalycium''' is a genus of mostly solitary cacti with ribbed stems and characteristic spiny floral tubes.


Flowers are diurnal, subapical, and funnel-shaped to campanulate, typically white, pink, or red. The floral tube bears characteristic spiny scales. Pollination is mainly by bees, occasionally by moths or hummingbirds.
* '''Habit''': Usually solitary; globose to shortly cylindrical; apex often depressed.
* '''Roots''': Fibrous to somewhat thickened.
* '''Stems''': Green to grey-green; compact.
* '''Ribs''': Well-defined, acute, often tuberculate.
* '''Areoles''': Closely spaced along ribs.
* '''Spines''': Straight, acicular to subulate; variable in number and length.
* '''Flowers''': Diurnal, subapical; funnel-shaped to campanulate; white, pink or red.
* '''Floral tube''': Covered with spiny scales (diagnostic feature).
* '''Pollination''': Mainly by bees and sphingid moths; rarely by hummingbirds.
* '''Fruits''': Spherical, hard; with persistent scales; dehiscent vertically.
* '''Seeds''': Brown to black, papillose; hilum depressed.
* '''Dispersal''': By water (hydrochory).


Fruits are spherical, hard, with persistent scales and dehisce vertically. Seeds are brown to black, papillose, with a depressed hilum, and are dispersed by water.
== Habitat ==
Occurs in arid to semi-arid mountainous environments:


== Habitat ==
* rocky slopes and hillsides
The genus grows in arid environments, typically on rocky slopes, among grasses and shrubs, in both exposed and partially shaded conditions.
* dry valleys
* grasslands and shrublands
 
Growing in full sun or partial shade among shrubs.
 
Altitude range: approximately 300–3300 m.


== Distribution ==
== Distribution ==
* Argentina – Catamarca, Córdoba, La Rioja, Salta, San Luis, Tucumán
Argentina:
 
* Catamarca
* Córdoba
* La Rioja
* Salta
* San Luis
* Tucumán
 
== Taxonomy ==
The genus has undergone significant reclassification.
 
Key points:
 
* Established by Backeberg (1936) from taxa previously included in ''Echinopsis''
* Often merged into ''Echinopsis'' sensu lato in broader classifications
* Arakaki (2003): supported recognition of the genus
* Bárcenas et al. (2011): confirmed separation of related taxa from ''Echinopsis''
* Schlumpberger & Renner (2012): accepted the genus but noted paraphyly
* Hernández-Hernández et al. (2011): showed distinct phylogenetic placement
 
The genus is retained as distinct following Lodé (2015).


== Species ==
== Species ==
The genus includes the following species:
According to Joël Lodé (2015):


* [[Acanthocalycium ferrarii]]
* [[Acanthocalycium ferrari]]
* [[Acanthocalycium glaucum]]
* [[Acanthocalycium glaucum]]
* [[Acanthocalycium klimpelianum]]
* [[Acanthocalycium klimpelianum]]
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== Notes ==
== Notes ==
* The genus currently includes five accepted species according to Joël Lodé.
* Originally described by Backeberg (1936).
* The genus has historically been included in ''Echinopsis'', but is maintained as distinct in this system.
* Considerable variability exists in spine development and flower coloration.


[[Category:Cactaceae genera]]
* Exhibits significant variability in spine morphology and flower coloration.
[[Category:Trichocereeae]]
* Some taxa may represent closely related populations rather than clearly distinct species.
* Shares evolutionary proximity with other genera of Trichocereinae, but remains morphologically distinct.
 
[[Category:Cactaceae]]
[[Category:Cactoideae]]
[[Category:Cereeae]]
[[Category:Trichocereinae]]
[[Category:Acanthocalycium]]

Revision as of 19:59, 27 April 2026

Acanthocalycium
File:Acanthocalycium spiniflorum.jpg
Kingdom Plantae
Family Cactaceae
Subfamily Cactoideae
Tribe Cereeae
SubTribe Trichocereinae
Genus Acanthocalycium
Species
Notes Taxonomy follows Joël Lodé (2015) with molecular insights from Arakaki (2003), Bárcenas et al. (2011), Hernández-Hernández et al. (2011), and Schlumpberger & Renner (2012).

Etymology

The name Acanthocalycium means “spiny calyx”, referring to the floral tube covered with spiny scales.

Description

Acanthocalycium is a genus of mostly solitary cacti with ribbed stems and characteristic spiny floral tubes.

  • Habit: Usually solitary; globose to shortly cylindrical; apex often depressed.
  • Roots: Fibrous to somewhat thickened.
  • Stems: Green to grey-green; compact.
  • Ribs: Well-defined, acute, often tuberculate.
  • Areoles: Closely spaced along ribs.
  • Spines: Straight, acicular to subulate; variable in number and length.
  • Flowers: Diurnal, subapical; funnel-shaped to campanulate; white, pink or red.
  • Floral tube: Covered with spiny scales (diagnostic feature).
  • Pollination: Mainly by bees and sphingid moths; rarely by hummingbirds.
  • Fruits: Spherical, hard; with persistent scales; dehiscent vertically.
  • Seeds: Brown to black, papillose; hilum depressed.
  • Dispersal: By water (hydrochory).

Habitat

Occurs in arid to semi-arid mountainous environments:

  • rocky slopes and hillsides
  • dry valleys
  • grasslands and shrublands

Growing in full sun or partial shade among shrubs.

Altitude range: approximately 300–3300 m.

Distribution

Argentina:

  • Catamarca
  • Córdoba
  • La Rioja
  • Salta
  • San Luis
  • Tucumán

Taxonomy

The genus has undergone significant reclassification.

Key points:

  • Established by Backeberg (1936) from taxa previously included in Echinopsis
  • Often merged into Echinopsis sensu lato in broader classifications
  • Arakaki (2003): supported recognition of the genus
  • Bárcenas et al. (2011): confirmed separation of related taxa from Echinopsis
  • Schlumpberger & Renner (2012): accepted the genus but noted paraphyly
  • Hernández-Hernández et al. (2011): showed distinct phylogenetic placement

The genus is retained as distinct following Lodé (2015).

Species

According to Joël Lodé (2015):

Notes

  • Exhibits significant variability in spine morphology and flower coloration.
  • Some taxa may represent closely related populations rather than clearly distinct species.
  • Shares evolutionary proximity with other genera of Trichocereinae, but remains morphologically distinct.
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