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 gibbosum (Haworth) Pfeiffer ex Mittler
(1844) |
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Habitat |
Argentinia
La Pampa,
Mendoza, San Luis, Buenes Aires,
Rio Negro, Rio Chubut,
Santa Cruz |
Description |
humpy Gymnocalycium
globular to elongated, 23.6 in (60 cm) high, 5.9 in (15 cm) Ø, rarely clumping, blueish to dirty green
ribs 12–19, with sharp crosswise furrows
areoles gray
7–14 radial spines, medium strength, slight bended, ± stand-away, with reddish base
flowers 2.5 in (6.5 cm) long, quite broad, white
fruits club shaped
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Synonyms |
Cactus gibbosus H. Haworth (1812)
Echinocactus gibbosus (H. Haworth) A. P. De Candolle (1828)
Cereus gibbosus (H. Haworth) L. Pfeiffer (1837)
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CITES |
Appendix II |
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