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  Gymnocalycium gibbosum v. brachypetalum CACTUSPEDIA       

 


Gymnocalycium gibbosum brachypetalum P101 (Choele Choel, Rio Negro, Argentina 300m)
 

Description: Solitary cactus.
Stem: Deep glaucous-green to grey-black, discoidal that became elonged with time 10-25 cm tall, up to 12 cm in diameter, the apex is slightly woolly.
Ribs: 10-16 straight, divided in well distinct angular ribs.
Areoles: Whitish-grey, elonged.
Radial spines: 5-7 20-35 mm long slightly bent against the plants body, clear brown with a darker base when young, that became whitish-grey with a black base as they age.
Central spines: 0-2 very similar to the radials.
Flowers: Infundibuliform in the nearest periphery just around the apex 45-60 mm long, 60-65 in diameter. Tepals ivory white with a brownish mid rib or occasionally reddish, throat greenish with a basal reddish area. Style white-greenish, stigma white. Anthers cream coloured.
Fruits: Globate or fusiform, 20-40 mm long green with white bordered scales.
Remarks Seems to be a pretty variable plant you might get some other names which are effectively the same plant.... and also not sure all plants identified as this are really this.

Cultivation: summer grower and pretty easy, water regularly in summer, keep rather dry in winter, but can handle excessive water to few water, best for half-shade but grow well in full sun and full shade too (but in full sun turns an uneven brownish red colour). style="font-family: Arial"> Frost Tolerance: Hardy to -12C.
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 of conspecific taxa, varieties, forms and cultivars of plants belonging to the Gymnocalycium gibbosum complex
(This Taxon has lots of synonyms ( like many other Gymnocalyciums) whit several controversial varieties and subspecies and comprises a multitude of different forms, but where each form is linked to others by populations of plants with intermediate characteristics):

Family: Cactaceae (Cactus Family)

Conservation status: Listed in CITES appendix 2.

Scientific name: Gymnocalycium gibbosum var. brachypetalum (Spegazzini) Backeberg
In:
Kaktus-ABC :289, 1935

Common NameBlack Chin Cactus

Origin: G. gibbosum is widely distributed in the mountains of Argentina from the south of the Buenos Aires province to Patagonia and show a great variability in morphological traits.

Synonyms:

  • Gymnocalycium brachypetalum (brachypethalum) Spegazzini,
    in: Anales de la Sociedad Cientifica de Argentina 99: 135, 1925
  • Gymnocalycium gibbosum v. brachypetalum (Spegazzini) Papsch 1996
  • Gymnocalycium gibbosum subsp.gibbosum var. brachypetalum (Speg.) Papsch,
    In: Gymnocalycium 9(4): 201, 1996
  • Gymnocalycium gibbosum var. nigrum Backeberg nom. inval. (Art. 37.1),
    In: Die Cactaceae 3: 1755,1959
  • Gymnocalycium gibbosum ssp. radekii Halda & Milt,
    In: Acta musei Richnoviensis Sect. natur, 9(1):63-64, 2002
  • Gymnocalycium nigrum n. n. Backeberg


 

 


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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.

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