Acanthocalycium: Difference between revisions

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Created page with "{{Taxobox | name = Acanthocalycium | image = | kingdom = Plantae | family = Cactaceae | subfamily = Cactoideae | tribe = Trichocereeae | genus = '''Acanthocalycium''' | species = | notes = Taxonomy according to Joël Lodé (2015). }} == Description == '''Acanthocalycium''' is a genus of cacti containing several species from Argentina. The name comes from the Greek ''akantha'' (meaning prickly) and ''kalyx'' (meaning buds), referring to the spines on th..."
 
 
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{{Taxobox
{{Taxobox
| name = Acanthocalycium
| name = Acanthocalycium
| image =  
| image = Acanthocalycium_spiniflorum.jpg
| kingdom = [[Plantae]]
| kingdom = [[Plantae]]
| family = [[Cactaceae]]
| family = [[Cactaceae]]
| subfamily = [[Cactoideae]]
| subfamily = [[Cactoideae]]
| tribe = [[Trichocereeae]]
| tribe = [[Cereeae]]
| subtribe = [[Trichocereinae]]
| genus = '''Acanthocalycium'''
| genus = '''Acanthocalycium'''
| species =  
| authority = Backeberg (1936)
| notes = Taxonomy according to Joël Lodé (2015).
| 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 ==
== Description ==
'''Acanthocalycium''' is a genus of cacti containing several species from Argentina. The name comes from the Greek ''akantha'' (meaning prickly) and ''kalyx'' (meaning buds), referring to the spines on the floral tubes.
'''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


These plants are generally globose to somewhat columnar, with many-ribbed stems. They are known for their beautiful flowers that range from white to pink, yellow, or red. They are popular in cultivation due to their hardiness and attractive spination.
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 ==
== Taxonomy ==
In the modern classification by '''Joël Lodé''', ''Acanthocalycium'' is maintained as a distinct genus within the tribe '''[[Trichocereeae]]'''. While some other systems have merged it with ''Echinopsis'', DNA studies supported by Lodé show it deserves generic status.
The genus has undergone significant reclassification.


== Species List (Lodé 1.19) ==
Key points:
Following the alphabetical index and errata of Joël Lodé, the following species are recognized:
 
* 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):


* [[Acanthocalycium ferrarii]]
* [[Acanthocalycium ferrarii]]
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* [[Acanthocalycium thionanthum]]
* [[Acanthocalycium thionanthum]]


== Cultivation ==
== Notes ==
Most species are easy to grow and can tolerate lower temperatures if kept completely dry during the winter. They prefer well-draining mineral soil and bright light to develop strong spines.
 
* 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.


[[Category:Trichocereeae]]
[[Category:Cactaceae]]
[[Category:Genera]]
[[Category:Cactoideae]]
[[Category:Cacti of Argentina]]
[[Category:Cereeae]]
[[Category:Trichocereinae]]
[[Category:Acanthocalycium]]

Latest revision as of 20:00, 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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