Gymnocalycium gibbosum brachypetalum
P101 (Choele Choel, Rio Negro, Argentina 300m)
Description: Solitary cactus.
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.
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.
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.
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
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
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
Conservation status: Listed in
CITES appendix 2.
Scientific name: Gymnocalycium gibbosum var.
brachypetalum (Spegazzini) Backeberg
Common Name: Black 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
- Gymnocalycium brachypetalum (brachypethalum)
in: Anales de la Sociedad Cientifica de Argentina 99: 135, 1925
- Gymnocalycium gibbosum v. brachypetalum (Spegazzini)
- Gymnocalycium gibbosum subsp.gibbosum var. brachypetalum
In: Gymnocalycium 9(4): 201, 1996
- Gymnocalycium gibbosum var. nigrum Backeberg nom.
inval. (Art. 37.1),
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