Acanthocalycium thionanthum: Difference between revisions

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{{Taxobox
{{Taxobox
| name = Acanthocalycium thionanthum
| name = Acanthocalycium thionanthum
| image = Acanthocalycium_thionanthum.jpg
| image = Acanthocalycium thionanthum.jpg
| kingdom = [[Plantae]]
| kingdom = [[Plantae]]
| family = [[Cactaceae]]
| family = [[Cactaceae]]
| subfamily = [[Cactoideae]]
| subfamily = [[Cactoideae]]
| tribe = [[Trichocereeae]]
| tribe = [[Trichocereeae]]
| subtribe = [[Trichocereinae]]
| genus = [[Acanthocalycium]]
| genus = [[Acanthocalycium]]
| species = '''A. thionanthum'''
| species = '''Acanthocalycium thionanthum'''
| binomial = ''Acanthocalycium thionanthum''
| binomial_authority = (Speg.) Backeb.
| notes = Taxonomy follows Joël Lodé (2015–2019).
| notes = Taxonomy follows Joël Lodé (2015–2019).
}}
}}


''Acanthocalycium thionanthum'' is a species of cactus in the genus [[Acanthocalycium]].
''Acanthocalycium thionanthum'' is a species of cactus in the genus [[Acanthocalycium]], native to Argentina.
 
== Etymology ==
The name ''thionanthum'' derives from Greek, referring to sulfur-yellow flowers ("thion" = sulfur, "anthos" = flower).


== Description ==
== Description ==
''Acanthocalycium thionanthum'' is a small to medium-sized cactus, usually solitary, with globose to short cylindrical stems. The epidermis is green to dark green, often slightly glossy.
'''Acanthocalycium thionanthum''' is a variable cactus species, usually solitary, with globose to short cylindrical stems. The epidermis is green to dark green, sometimes slightly glaucous.


Ribs are well defined, with rounded to slightly acute edges. Areoles are spaced regularly and bear numerous radial spines and several central spines. Spines are straight, acicular, varying in color from whitish to brownish.
The ribs are well defined, typically numbering between 9 and 15, with rounded margins. Areoles bear numerous radial spines and several central spines. Spines are straight, varying in color from whitish to brownish or gray.


Flowers are diurnal, funnel-shaped, typically yellow to pale yellow, occasionally with a slight greenish hue. They arise near the apex and have a spiny floral tube.
Flowers are funnel-shaped, diurnal, and variable in color, ranging from yellow to white or pinkish tones. The floral tube bears characteristic scales with spines, hairs, and bristles.


Fruits are spherical, dry, and dehiscent, with persistent scales. Seeds are small, dark, and papillose.
Fruits are spherical, dry, and dehiscent. Seeds are small, dark, and papillose.
 
== Habitat ==
The species grows in arid to semi-arid environments, often on rocky slopes or among grasses and low shrubs. It tolerates strong sunlight but can also be found in lightly shaded conditions.


== Distribution ==
== Distribution ==
* Argentina – Catamarca, La Rioja, Salta, Tucumán
* Argentina – Catamarca, La Rioja, Salta, Tucumán
== Taxonomy ==
According to '''Joël Lodé''', this species is recognized within the genus [[Acanthocalycium]].


== Synonyms ==
== Synonyms ==
{{columns-list|1|
* ''[[Acanthocalycium aurantiacum]]''
* ''Echinopsis thionantha'' (Speg.)
* ''[[Acanthocalycium brevispinum]]''
* ''Lobivia thionantha'' (Speg.)
* ''[[Acanthocalycium catamarcense]]''
* ''Acanthocalycium brevispinum''
* ''[[Acanthocalycium chionanthum]]''
* ''Echinopsis brevispina''
* ''[[Acanthocalycium griseum]]''
}}
* ''[[Echinopsis thionantha]]''
* ''[[Lobivia thionantha]]''
* ''[[Echinocactus thionanthus]]''
* ''[[Echinopsis brevispina]]''
* ''[[Lobivia brevispina]]''
* ''[[Echinopsis chionantha]]''
* ''[[Lobivia chionantha]]''
* ''[[Echinocactus chionanthus]]''


== Notes ==
== Notes ==
* Originally described as ''Echinopsis thionantha'' by Spegazzini.
* One of the most variable species within the genus.
* Later transferred to ''Acanthocalycium'' by Backeberg.
* Has been described under numerous names, later unified under ''Acanthocalycium thionanthum''.
* The species shows variability in spine density and flower coloration.
* Variation occurs in spine density, stem coloration, and flower color.
* Sometimes included within ''Echinopsis'' in broader classifications.
 
== Cultivation ==
* prefers well-draining mineral substrate 
* requires bright light to full sun 
* moderate watering during active growth 
* keep dry and cool in winter 


[[Category:Cactaceae]]
[[Category:Cactaceae]]
[[Category:Cactoideae]]
[[Category:Trichocereeae]]
[[Category:Trichocereeae]]
 
[[Category:Acanthocalycium]]
{{Acanthocalycium species}}

Latest revision as of 15:53, 13 April 2026

Acanthocalycium thionanthum
Kingdom Plantae
Family Cactaceae
Subfamily Cactoideae
Tribe Trichocereeae
SubTribe
Genus Acanthocalycium
Species Acanthocalycium thionanthum
Notes Taxonomy follows Joël Lodé (2015–2019).

Acanthocalycium thionanthum is a species of cactus in the genus Acanthocalycium, native to Argentina.

Description

Acanthocalycium thionanthum is a variable cactus species, usually solitary, with globose to short cylindrical stems. The epidermis is green to dark green, sometimes slightly glaucous.

The ribs are well defined, typically numbering between 9 and 15, with rounded margins. Areoles bear numerous radial spines and several central spines. Spines are straight, varying in color from whitish to brownish or gray.

Flowers are funnel-shaped, diurnal, and variable in color, ranging from yellow to white or pinkish tones. The floral tube bears characteristic scales with spines, hairs, and bristles.

Fruits are spherical, dry, and dehiscent. Seeds are small, dark, and papillose.

Distribution

  • Argentina – Catamarca, La Rioja, Salta, Tucumán

Taxonomy

According to Joël Lodé, this species is recognized within the genus Acanthocalycium.

Synonyms

Notes

  • One of the most variable species within the genus.
  • Has been described under numerous names, later unified under Acanthocalycium thionanthum.
  • Variation occurs in spine density, stem coloration, and flower color.

Cultivation

  • prefers well-draining mineral substrate
  • requires bright light to full sun
  • moderate watering during active growth
  • keep dry and cool in winter
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