Acharagma: Difference between revisions

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Created page with "{{Taxobox | name = Acharagma | image = Acharagma.jpg | kingdom = Plantae | family = Cactaceae | subfamily = Cactoideae | tribe = Cacteae | genus = '''Acharagma''' | notes = Taxonomy follows Joël Lodé (2015–2019). }} == Etymology == The name ''Acharagma'' derives from the Greek meaning “no groove”, referring to the absence of an areolar groove on the tubercles, unlike related genera such as ''Coryphantha'' and ''Escobaria''. == Description == '''..."
 
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{{Taxobox
{{Taxobox
| name = Acharagma
| name = Acharagma
| image = Acharagma.jpg
| image = Acharagma_roseanum.jpg
| kingdom = [[Plantae]]
| kingdom = [[Plantae]]
| family = [[Cactaceae]]
| family = [[Cactaceae]]
Line 7: Line 7:
| tribe = [[Cacteae]]
| tribe = [[Cacteae]]
| genus = '''Acharagma'''
| genus = '''Acharagma'''
| notes = Taxonomy follows Joël Lodé (2015–2019).
| authority = (N.P.Taylor) Glass & A.D.Zimmerman (1998)
| notes = Taxonomy follows Joël Lodé (2015) with molecular support from Wallace (1995), Butterworth et al. (2002), Crozier (2005), Hernández-Hernández et al. (2011), and Vázquez-Sánchez et al. (2013).
}}
}}


== Etymology ==
== Etymology ==
The name ''Acharagma'' derives from the Greek meaning “no groove”, referring to the absence of an areolar groove on the tubercles, unlike related genera such as ''Coryphantha'' and ''Escobaria''.
The name ''Acharagma'' means “without groove”, referring to the absence of an areolar groove on the tubercles, unlike related genera such as ''Coryphantha'' and ''Escobaria''.


== Description ==
== Description ==
'''Acharagma''' is a genus of small cacti, usually solitary or forming clusters, with globose to shortly cylindrical stems.
'''Acharagma''' is a genus of small, globose to short cylindrical cacti with dense spination and reduced floral structures.


Tubercles lack both nectar glands and areolar grooves. The epidermis is densely covered with spines.
* '''Habit''': Solitary or forming small clumps (caespitose).
* '''Roots''': Fibrous to somewhat thickened.
* '''Stems''': Globose to short cylindrical, compact.
* '''Ribs''': Absent.
* '''Tubercles''': Prominent, without areolar groove and without nectar glands.
* '''Areoles''': Terminal, woolly when young.
* '''Spines''': Numerous, dense, covering the epidermis.
* '''Flowers''': Diurnal, apical, funnel-shaped; creamy white to yellow, often tinged pink or reddish; self-sterile.
* '''Pollination''': By insects.
* '''Fruits''': Naked, indehiscent; floral remnants persistent.
* '''Seeds''': Brown to black, finely foveolate.


Flowers are diurnal, apical, funnel-shaped, and typically creamy white to yellow, often with pinkish or reddish tones. They are self-sterile and pollinated by insects.
== Habitat ==
Occurs in restricted semi-desert environments:


Fruits are naked, indehiscent, with persistent floral remains. Seeds are brown to black, finely foveolate.
* xerophytic shrublands
* rocky slopes and hillsides
* limestone, sandstone, or gypsum substrates
* cliff crevices and mountainous terrain


== Habitat ==
Often found among shrubs or in full sun, sometimes near seasonal watercourses.
The genus grows in semi-desert environments, typically on rocky limestone, sandstone, or gypsum soils, in mountainous or hilly terrain. Plants are found among shrubs, in rock crevices, and in both shaded and exposed conditions.


Altitude range: approximately 1000–2650 m.
Altitude range: approximately 1000–2650 m.


== Distribution ==
== Distribution ==
* Mexico – Coahuila, Nuevo León
Mexico:
 
* Coahuila
* Nuevo León
 
== Taxonomy ==
The genus is well supported as distinct and monophyletic.
 
Key points:
 
* Initially placed in ''Gymnocactus'' (Glass & Foster, 1970)
* Later transferred to ''Turbinicarpus'' and ''Escobaria''
* Wallace (1995): molecular data indicated a distinct lineage
* Glass & Zimmerman (1998): established genus status
* Butterworth et al. (2002): separated from ''Escobaria''
* Crozier (2005) and Hernández-Hernández et al. (2011): confirmed distinct clade
* Vázquez-Sánchez et al. (2013): confirmed monophyly
 
The genus is clearly separated from morphologically similar taxa.


== Species ==
== Species ==
The genus includes the following species:
According to Joël Lodé (2015):


* [[Acharagma aguirreanum]]
* [[Acharagma aguirreanum]]
* [[Acharagma huasteca]]
* [[Acharagma huasteca]]
* [[Acharagma roseanum]]
* [[Acharagma roseanum]]
  ** [[Acharagma roseanum subsp. galeanense]]


=== Subspecies ===
== Notes ==
* [[Acharagma roseanum subsp. galeanense]]


== Notes ==
* A highly localized genus with very restricted distribution.
* The genus is maintained as distinct based on morphological and molecular evidence.
* Morphologically similar to ''Escobaria'', but lacking the diagnostic areolar groove.
* Previously included in ''Gymnocactus'', ''Turbinicarpus'', and ''Escobaria''.
* The status of ''Acharagma roseanum subsp. galeanense'' remains uncertain and may warrant species rank.
* Molecular studies confirm it as a separate monophyletic lineage.
* A small but well-defined genus with restricted distribution.


[[Category:Cactaceae genera]]
[[Category:Cactaceae]]
[[Category:Cactoideae]]
[[Category:Cacteae]]
[[Category:Cacteae]]
[[Category:Acharagma]]

Latest revision as of 07:38, 24 April 2026

Acharagma
File:Acharagma roseanum.jpg
Kingdom Plantae
Family Cactaceae
Subfamily Cactoideae
Tribe Cacteae
SubTribe
Genus Acharagma
Species
Notes Taxonomy follows Joël Lodé (2015) with molecular support from Wallace (1995), Butterworth et al. (2002), Crozier (2005), Hernández-Hernández et al. (2011), and Vázquez-Sánchez et al. (2013).

Etymology

The name Acharagma means “without groove”, referring to the absence of an areolar groove on the tubercles, unlike related genera such as Coryphantha and Escobaria.

Description

Acharagma is a genus of small, globose to short cylindrical cacti with dense spination and reduced floral structures.

  • Habit: Solitary or forming small clumps (caespitose).
  • Roots: Fibrous to somewhat thickened.
  • Stems: Globose to short cylindrical, compact.
  • Ribs: Absent.
  • Tubercles: Prominent, without areolar groove and without nectar glands.
  • Areoles: Terminal, woolly when young.
  • Spines: Numerous, dense, covering the epidermis.
  • Flowers: Diurnal, apical, funnel-shaped; creamy white to yellow, often tinged pink or reddish; self-sterile.
  • Pollination: By insects.
  • Fruits: Naked, indehiscent; floral remnants persistent.
  • Seeds: Brown to black, finely foveolate.

Habitat

Occurs in restricted semi-desert environments:

  • xerophytic shrublands
  • rocky slopes and hillsides
  • limestone, sandstone, or gypsum substrates
  • cliff crevices and mountainous terrain

Often found among shrubs or in full sun, sometimes near seasonal watercourses.

Altitude range: approximately 1000–2650 m.

Distribution

Mexico:

  • Coahuila
  • Nuevo León

Taxonomy

The genus is well supported as distinct and monophyletic.

Key points:

  • Initially placed in Gymnocactus (Glass & Foster, 1970)
  • Later transferred to Turbinicarpus and Escobaria
  • Wallace (1995): molecular data indicated a distinct lineage
  • Glass & Zimmerman (1998): established genus status
  • Butterworth et al. (2002): separated from Escobaria
  • Crozier (2005) and Hernández-Hernández et al. (2011): confirmed distinct clade
  • Vázquez-Sánchez et al. (2013): confirmed monophyly

The genus is clearly separated from morphologically similar taxa.

Species

According to Joël Lodé (2015): 

 ** Acharagma roseanum subsp. galeanense

Notes

  • A highly localized genus with very restricted distribution.
  • Morphologically similar to Escobaria, but lacking the diagnostic areolar groove.
  • The status of Acharagma roseanum subsp. galeanense remains uncertain and may warrant species rank.
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