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Gymnocalycium occultum
(Syn: Gymnocalycium stellatum subsp. occultum)
CACTUSPEDIA       

 


Gymnocalycium occultum P131 Tres Puentes, Catamarca, Argentina 700m
This is one the
most unusual and desirable of the Gymnocalyciums.
 

Description: G. occultum (= G. stellatum)  is a beautiful, slowly-growing plant with a noticeably flatten body,  at first solitary, later clustering.
Stem: Dark grayish-brown to olive
-coloured epidermis, flattened globose, 7.5-10 cm in diameter.   It will offset after a considerable period of time.
Ribs: 7-11, flat
, round, without prominent chin-like protrusions.
Spines: 3-5
, dark brown, becoming grey with age, spider-like, add-pressed, short, straight to slightly curved and flattened against the stem (rarely sticking out - easy cactus to handle)
Flowers: Creamy-white with a
dull red throat, up to 6,5 cm. long, 4.5 cm. in diameter.
Fruits: Cylind
rical.
Blooming season: Flowers are produced in late spring and remain open for up to twelve days.

Recognized subspecies, varieties and forms:

The “occultum” subspecies occurs in Catamarca.
The “stellatum” subspecies occurs in Cordoba.

Cultivation: This Gymnocalycium is supposed to be one of the most difficult species in cultivation, and very slow to get to a reasonable size. It will offset after a considerable period of time.   It is a summer-growing species that needs regular water in summer (but do not over-water).  Keep rather dry in winter.  This plant does not like extremely bright situations.  Give it some shade during the hottest part of the day.  Keep this plant in a low PH compost;  otherwise growth will stop altogether.  Feed it with a high potassium fertilizer in summer.  It is quite frost resistant if kept dry (hardy to  -5° C)
Propagation: Direct sow after last frost.(seldom produces offsets)
 

Photo gallery: Alphabetical listing of Cactus and Succulent pictures published in this site.

Photo gallery Gymnocalicium

Family: Cactaceae (Cactus Family)

Scientific name:  Gymnocalycium occultum Fric ex Schütz 1962

Origin:  Argentina Catamarca at low elevation.

Conservation status: Listed in CITES appendix 2.

Synonyms:  

  • Gymnocalycium stellatum subsp. occultum (Frič ex Schütz) H.Till & W.Till, 1996
  • Gymnocalycium obductum Piltz,
    Pubblished in: Succulenta 69(4): 74-78 + title plate, 1990 = stellatum
  • Gymnocalycium stellatum (Speg.) Speg. 1925
  • Echinocactus stellatus Spegazzini
  • Gymnocalycium asterias Y-Ito
  • Gymnocalycium asterium A. castellanos 1957 (Illegitimate name)
  • Gymnocalycium stellatum ssp. asterium


 

 

 

Photo of conspecific taxa, varieties, forms and cultivars of plants belonging to the Gymnocalicyum stellatum complex



 

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This old page has been moved! Click the link next on the right to enter the new Enciclopedia of Cacti. We hope you find this new site informative and useful.

The Encyclopedia of Cacti