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 horstii Buining (1970) |
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Habitat |
Brazil
Rio Grande do Sul -
at Cacapava |
Description |
named after Leopold Horst
usually flattened globular, 2.8 in (7 cm) high, 4.3 in (11 cm) Ø, shiny green
ribs 5–6, with slight humps
areoles about 3 per rib, in 1.2 in (3 cm) distance, ovally, felted
5 radial spines, to 1,2 in (3 cm) long, straight, slant protruding, light yellow, one of it downward directed
central spine is absent
flowers to 4.3 in (11 cm) long and Ø, open complete into full sun at the daytime,
cream white and lilac pink with pink midvein, outer petals dark pink,
style and stigma light yellow
fruits oval, green, slowly ripening; seeds hat shaped, small
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Synonyms |
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CITES |
Appendix II |
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