Perhaps the most unusual and desirable of the
Description: Gymnocacalycium ragonesei is a
very small, slowly growing
(usually) solitary cactus.
Stem: Dark grayish-brown to olive coloured epidermis, flattened, up
to 7.5 cm in diameter.
Spines: Short pale spines flattened against cacti (rarely
sticking out - easy cactus to handle)
Flowers: Creamy-white with a reddish throat, up to 5 cm. long,
Blooming season: Flowers are produced in late spring and remain
open for up to twelve days.
and © copyright by
B. (Bologna, Italy)
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
Photo of conspecific
taxa, varieties, forms and cultivars of plants
belonging to the Gymnocalicyum
Published in: Lilloa 23: 5-13, 1950 The species name is spelled ragonesii or ragonesei,
but the Kew Index lists it as ragonesei.
Etymology: It is named after its collector whose name was
Argentina (Catamarca, Cordoba) at low elevation.
Conservation status: Listed in
CITES appendix 2.
- Gymnocalycium obductum Piltz,
Pubblished in: Succulenta 69(4): 74-78 + title
plate, 1990 = stellatum