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]].
== Description ==
'''Acanthocalycium thionanthum''' is a small to medium-sized cactus species native to Argentina. Plants are usually solitary, globose to short cylindrical, dark green to gray-green, reaching up to 12 cm in height and 10 cm in diameter.


== Etymology ==
The ribs are 9–15, rounded and slightly notched. Areoles are elliptical. Spines are awl-shaped, gray with darker tips, typically 1–1.5 cm long. Central spines (1–4) may be absent, while radial spines number 5–10.
The name ''thionanthum'' derives from Greek, referring to sulfur-yellow flowers ("thion" = sulfur, "anthos" = flower).


== Description ==
Flowers are somewhat bell-shaped and variable in color, ranging from bright yellow to red or white, up to 4.5 cm in length and diameter. Floral tubes bear dark, spine-tipped scales along with hairs and bristles. Fruits are globose, dry, and dehiscent, up to 1 cm in diameter.
''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.


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.
== Distribution ==
* Argentina – Salta Province


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.
== Taxonomy ==
According to '''Joël Lodé''', this species is placed in the genus [[Acanthocalycium]].


Fruits are spherical, dry, and dehiscent, with persistent scales. Seeds are small, dark, and papillose.
{{TaxonomySource}}


== Habitat ==
== Species within the genus ==
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.
* [[Acanthocalycium ferrarii]]
* [[Acanthocalycium glaucum]]
* [[Acanthocalycium klimpelianum]]
* [[Acanthocalycium spiniflorum]]
* '''Acanthocalycium thionanthum'''


== Distribution ==
== Synonyms ==
* Argentina – Catamarca, La Rioja, Salta, Tucumán
The following names have been applied to this species:


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


== Notes ==
== Notes ==
* Originally described as ''Echinopsis thionantha'' by Spegazzini.
* Species shows high variability in flower color and spine development.
* Later transferred to ''Acanthocalycium'' by Backeberg.
* Frequently encountered under different generic names in horticulture.
* The species shows variability in spine density and flower coloration.
* One of the more widely distributed species within the genus.
* Sometimes included within ''Echinopsis'' in broader classifications.
 
== Cultivation ==
This species is relatively easy to cultivate:
* prefers well-draining mineral substrate 
* requires bright light for compact growth 
* tolerates cool temperatures if kept dry in winter 


[[Category:Cactaceae]]
[[Category:Cactaceae species]]
[[Category:Flora of Argentina]]
[[Category:Trichocereeae]]
[[Category:Trichocereeae]]
{{Acanthocalycium species}}

Revision as of 23:01, 11 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).

Description

Acanthocalycium thionanthum is a small to medium-sized cactus species native to Argentina. Plants are usually solitary, globose to short cylindrical, dark green to gray-green, reaching up to 12 cm in height and 10 cm in diameter.

The ribs are 9–15, rounded and slightly notched. Areoles are elliptical. Spines are awl-shaped, gray with darker tips, typically 1–1.5 cm long. Central spines (1–4) may be absent, while radial spines number 5–10.

Flowers are somewhat bell-shaped and variable in color, ranging from bright yellow to red or white, up to 4.5 cm in length and diameter. Floral tubes bear dark, spine-tipped scales along with hairs and bristles. Fruits are globose, dry, and dehiscent, up to 1 cm in diameter.

Distribution

  • Argentina – Salta Province

Taxonomy

According to Joël Lodé, this species is placed in the genus Acanthocalycium.

📚 Taxonomy note: Taxonomic placement follows the system of Joël Lodé (2015–2019).

Species within the genus

Synonyms

The following names have been applied to this species:

Notes

  • Species shows high variability in flower color and spine development.
  • Frequently encountered under different generic names in horticulture.
  • One of the more widely distributed species within the genus.

Cultivation

This species is relatively easy to cultivate:

  • prefers well-draining mineral substrate
  • requires bright light for compact growth
  • tolerates cool temperatures if kept dry in winter
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