Acanthocalycium thionanthum: Difference between revisions

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== Description ==
== 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.
'''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 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 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 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.
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 ==
== Distribution ==
* Argentina – Salta Province
* Argentina – Catamarca, La Rioja, Salta, Tucumán


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


== Synonyms ==
== Synonyms ==
* ''[[Acanthocalycium aurantiacum]]''
* ''[[Acanthocalycium brevispinum]]''
* ''[[Acanthocalycium catamarcense]]''
* ''[[Acanthocalycium chionanthum]]''
* ''[[Acanthocalycium griseum]]''
* ''[[Echinopsis thionantha]]''
* ''[[Echinopsis thionantha]]''
* ''[[Lobivia thionantha]]''
* ''[[Echinocactus thionanthus]]''
* ''[[Echinocactus thionanthus]]''
* ''[[Lobivia thionantha]]''
* ''[[Echinopsis brevispina]]''
* ''[[Lobivia brevispina]]''
* ''[[Echinopsis chionantha]]''
* ''[[Lobivia chionantha]]''
* ''[[Echinocactus chionanthus]]''
* ''[[Echinocactus chionanthus]]''
* ''[[Lobivia chionantha]]''
* ''[[Echinopsis chionantha]]''
* ''[[Acanthocalycium chionanthum]]''
* ''[[Acanthocalycium brevispinum]]''
* ''[[Echinopsis brevispinum]]''
* ''[[Acanthocalycium griseum]]''
* ''[[Acanthocalycium catamarcense]]''


== Notes ==
== Notes ==
* Species shows high variability in flower color and spine development.
* One of the most variable species within the genus.
* Frequently encountered under different generic names in horticulture.
* Has been described under numerous names, later unified under ''Acanthocalycium thionanthum''.
* One of the more widely distributed species within the genus.
* Variation occurs in spine density, stem coloration, and flower color.


== Cultivation ==
== Cultivation ==
This species is relatively easy to cultivate:
* prefers well-draining mineral substrate   
* prefers well-draining mineral substrate   
* requires bright light to full sun   
* requires bright light to full sun   

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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