Acanthocalycium glaucum: Difference between revisions

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{{Taxobox
{{Taxobox
| name = Acanthocalycium glaucum
| name = Acanthocalycium glaucum
| image = Acanthocalycium_glaucum.jpg
| image = Acanthocalycium glaucum.jpg
| kingdom = [[Plantae]]
| kingdom = [[Plantae]]
| family = [[Cactaceae]]
| family = [[Cactaceae]]
Line 8: Line 8:
| genus = [[Acanthocalycium]]
| genus = [[Acanthocalycium]]
| species = '''Acanthocalycium glaucum'''
| species = '''Acanthocalycium glaucum'''
| notes = Taxonomy according to Joël Lodé (v1.19).
| notes = Taxonomy follows Joël Lodé (2015–2019).
}}
}}
''Acanthocalycium glaucum'' is a species of cactus in the genus [[Acanthocalycium]], native to Argentina.


== Description ==
== Description ==
'''Acanthocalycium glaucum''' is a small, solitary cactus species characterized by its distinct glaucous (bluish-grey to silvery-green) epidermis. The stems are globose to short cylindrical, reaching up to 10-15 cm in height.
'''Acanthocalycium glaucum''' is a small cactus species, typically solitary, with globose to short cylindrical stems. The epidermis is characteristically bluish-green (glaucous), giving the species its name.


The ribs (typically 8–14) are well-defined and slightly tuberculate. Areoles are felted, bearing 5–10 radial spines that are straight, dark grey to blackish when young, later turning grey.  
The ribs are well defined, usually numbering between 8 and 12, with slightly rounded margins. Areoles are small and bear numerous fine radial spines and a few central spines. Spines are slender, straight, and pale, often whitish to light yellow, becoming gray with age.


The flowers are a highlight of this species: funnel-shaped, typically '''bright yellow to orange-yellow''', about 6 cm in diameter. The floral tube is covered with characteristic papery scales and white hairs, which gives the genus its name.
Flowers are diurnal, funnel-shaped, and generally pale yellow to creamy white, sometimes with slight pinkish tones. They arise near the apex and have a floral tube bearing small scales with hairs and spines.
 
Fruits are small, spherical, dry, and dehiscent. Seeds are small, dark, and papillose.


== Distribution ==
== Distribution ==
* '''Argentina:''' Found primarily in the provinces of Catamarca and La Rioja, growing in rocky, mineral-rich soils at altitudes between 500 and 1000m.
* Argentina – Catamarca, La Rioja


== Taxonomy ==
== Taxonomy ==
According to '''Joël Lodé (Taxonomy of the Cactaceae, 2015)''', ''Acanthocalycium glaucum'' is a distinct and accepted species. While some previous authors (like Hunt) treated it as a variety of ''Acanthocalycium thionanthum'', molecular and morphological data supported by Lodé maintain its specific rank.
According to '''Joël Lodé''', this species is recognized within the genus [[Acanthocalycium]].


== Species within the genus ==
== Synonyms ==
* [[Acanthocalycium ferrarii]]
* ''[[Acanthocalycium glaucina]]''
* [[Acanthocalycium glaucum]]
* ''[[Acanthocalycium aurantiaca]]''
* [[Acanthocalycium klimpelianum]]
* ''[[Echinopsis glaucina]]''
* [[Acanthocalycium spiniflorum]]
* ''[[Echinopsis aurantiaca]]''
* [[Acanthocalycium thionanthum]]


== Synonyms ==
== Notes ==
Based on the '''Lodé Index (v1.19)''', the following names are associated with this taxon:
* Named for its characteristic glaucous (bluish) stem coloration.
* ''Acanthocalycium aurantiacum'' Rausch
* Shows moderate variability in spine density and coloration.
* ''Acanthocalycium thionanthum var. glaucum'' (Ritter) Donald
* Includes taxa previously described under different names, later unified under this species.
* ''Echinopsis glaucina'' H.Friedrich & G.D.Rowley
* ''Lobivia thionantha var. glauca'' (Ritter) Rausch


== Cultivation ==
== Cultivation ==
This species is highly valued by collectors for its contrast between the blue skin and yellow flowers.
* prefers well-draining mineral substrate
* '''Soil:''' Requires a strictly mineral, well-draining substrate.
* requires bright light to full sun 
* '''Watering:''' Regular during summer, but must be kept '''completely dry''' in winter to prevent root rot.
* moderate watering during active growth 
* '''Light:''' Needs full sun to maintain its glaucous wax coating and produce dense spines.
* keep dry and cool in winter 
* '''Hardiness:''' Can tolerate brief frosts down to -5°C if dry.
 


[[Category:Cactaceae]]
[[Category:Cactaceae]]

Latest revision as of 06:08, 14 April 2026

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

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

Description

Acanthocalycium glaucum is a small cactus species, typically solitary, with globose to short cylindrical stems. The epidermis is characteristically bluish-green (glaucous), giving the species its name.

The ribs are well defined, usually numbering between 8 and 12, with slightly rounded margins. Areoles are small and bear numerous fine radial spines and a few central spines. Spines are slender, straight, and pale, often whitish to light yellow, becoming gray with age.

Flowers are diurnal, funnel-shaped, and generally pale yellow to creamy white, sometimes with slight pinkish tones. They arise near the apex and have a floral tube bearing small scales with hairs and spines.

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

Distribution

  • Argentina – Catamarca, La Rioja

Taxonomy

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

Synonyms

Notes

  • Named for its characteristic glaucous (bluish) stem coloration.
  • Shows moderate variability in spine density and coloration.
  • Includes taxa previously described under different names, later unified under this species.

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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