Gymnocalycium Pfeiffer ex Mittler (1844)
(Greek gymnos = naked, Greek kalyx = calyx)
naked flower calyx
because of the calyx without spines, bristles and hairs
usually flat globular, in age some thick columnar, very different sizes, simple or clumping
ribs 20 or less;
spines adjacent or outspread, thin to very strong
flowers small short to large funnel shaped, often white or white with red center, however also yellow or red,
calyx bare and scaly; fruits and seeds very different |
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Distribution |
south America - Bolivia, Paraguay, south Brazil to Argentinia
almost complete south America eastern of the Cordilleras
steppes and mountains |
Growth period |
warm and part shady, avoid full sun, temporarily a location outdoor is possible
plants with stronger spines can get more sun
from early summer abundant watering, but standing moisture is to avoid
especially at warm weather not to sparse moisture |
Winter period |
bright and cool, not to dry, at 6–12°C (42–53°F), as possible not under 5°C (41°F)
mountain species occasionally also colder |
Substrat |
nutrient rich, very permeable to water with addition of peat |
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| Gymnocalycium achirasense H. Till & Schatzl ex H. Till (1987) |
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Habitat |
Argentinia
San Luis -
near of Achiras in about 1000 m
(3280 ft) altitude
between rocks and grass |
Description |
named after origin
globular to elongated globular, about 5.6 cm (2.2 in) high, 7 cm (2.7 in) Ø, gray-green
12–15 straight ribs, seperated in chinlike protrusions
areoles oval, at the beginning slightly felted, soon bare
10–12 radial spines, straight to faintly arcuate, at the base dark, to the tip bright horn-colored,
about 2.5 cm (1 in) long, alike central spine, straight to somewhat bent
flowers funnel shaped, 5.8 cm (2.3 in) long, 7.1 cm (2.8 in) Ø, white with purple-pink midvein
style yellowish white with a twelvepart bright yellow strigma
seeds small
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Synonyms |
Gymnocalycium horridispinum var. achirasense (H. Till & Schatzl) Lodé (1995)
Gymnocalycium monvillei ssp. achirasense (H. Till & Schatzl ex H. Till) H. Till (1993)
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CITES |
Appendix II |
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