Gymnocalycium castellanodsii WR715 Buenos Aires to
La Rioja, Argentina
The spines are very strong and impressive.
Summer-growing and pretty easy, water regularly in summer, and keep
rather dry in winter. However it can handle excessive water to little
water. It grows well in full sun or half sun, too (but in
full sun it will form stronger spines).
Propagation: Seeds (it seldom produces offsets)
Scientific name: Gymnocalycium castellanosii Backeberg
in Backeberg et Knuth, Kaktus - ABC, p. 287, 416, 1935
Origin: Cordoba, Argentina (South of La Rioja, East of San Juan
And west of Cordoba)
Habitat: It is found on granite or on red
sandstone mountains in scarce and almost deprived of nutrients soil,
with summer daily temperatures raising above 40° C.
Conservation status: Listed in
CITES appendix 2.
Common English Names include: Long horn
Etymology: Named after Dr. Alberto
Castellanos (1897-1968) Argentinean botanist and specialist in
Cactaceae and Breliaceae. it was assistant to Carlos Spegazzini
at Buenos Aires museum and in Cordoba, from 1955 onwards in Brazilian
The genus name "Gymnocalycium" comes from the Greek for
"naked calyx" referring to the flower buds bearing no hair or
Slaba nom. inval. (Art.41.3b)
Kaktusy 20(4): 77-83 (1984) und 20(5): 99-104
- Gymnocalycium borzingianum Shutz
- Gymnocalycium acorrugatum J.G.
Note: The taxonomy of this species is not
clear. The former synonym
Gymnocalycium ferox (Backeberg) Slaba
1984 seems to be
Solitary plant with fairly heavy spines bent backward in a distinctive
Stem: Up to 15 cm in diameter an 10 cm tall, dull green or
bluish-green, apex depressed with confluent areoles forming a woolly
Ribs: 10-12, with rounded sharply separated tubercles in young
specimens that progressively becomes almost flat in mature plant.
Subulate, stout, thick and straight or
all whitish, greyish or brownish, with a darker tip, up to 2,5 cm
Radial spines: 5-7(-8)
Central spines: 0-2
Flower Colour: Bell-shaped or funnelform, up to 4,5 cm in
diameter, white to very light pink with a pink or reddish throat.
Fruit: Spherical or slightly ovoidal green.
Fruit must be significantly
overripe before harvesting seed; clean and dry seeds