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  Gymnocalycium ritterianum
(Gymnocalycium riterianum)
CACTUSPEDIA       

 


G. ritterianum has attractive stems and freely produces nice satiny white or pink flowers with rosy throats. This plant is still rare in collections, but, like many of its genus, it is easy to cultivate.
 

Description: It is a variable small cactus, usually solitary to occasionally clustering.
Stem: Flattened, discoidal 4-4 cm tall, 8-11 cm in diameter, clear grey-green, that tinges reddish in full sun.
Ribs: 10-12, with tranverse furrows, divided in pronounced humped, chin-like tubercles.
Spines: 7-9, up to 2,5 cm long, white, yellow or pink/brown, curved against the plants body, one directed downward , others to the sides
Central spine: None, or sometimes one, straight, rigid, curving backward.
Flowers: Near the apex, up to 6,5 cm long and 7,7 cm in diameter, usually satiny white with rosy to violet throats, but also pure white, pink or red
Blooming season: Flowers appear recurrently from April to autumn.
Fruits: Pear shaped, bluish.
 

 

 

 

 

Family: Cactaceae (Cactus Family)

Conservation status: Listed in CITES appendix 2.

Scientific name:  Gymnocalycium ritterianum Rausch
In: KuaS 23(7): 180-181, 1972

Synonyms:

  • Gymnocalycium riteranum
  • Gymnocalycium famatimensis Rausch nom. nud.

Origin:  Argentina (La Rioja)

Etymology:  Ritter and Rausch are two explorers who played major roles in finding and cataloguing the cacti of South America . With this species, one commemorates the other.


 

 


Cultivation: It is a summer grower species that offers no cultivation difficulties.  Water regularly in summer (but do not overwater ) Keep this plant almost dry in winter at a minimum temperature of 0C, prefer relatively rich substrate and  low pH  compost (if possible not limestone) otherwise growth will stop altogether. Feed with a high potassium fertilizer in summer. It is quite frost resistant if kept dry (hardy to -5 C)
Sun Exposure: Light shade. It may
tolerate bright situations  but is
likely to suffer from sun scorch or stunted growth if over exposed to direct sunlight during the hottest part of the day in summer. This plant needs plenty of space for its roots, repotting should be done every other year or when the it has outgrown its pot. This species is particularly easy and accommodating, seldom suffer of cryptogamic diseases.

Propagation: Direct sow after last frost. (seldom produces offsets). Seed Collecting: Permit fruit to ripen.  Fruit must be significantly overripe before harvesting seed; clean and dry seeds
 


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

Photo gallery Gymnocalicium



 

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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