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 borthii Koop ex H. Till (1987) |
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Field number |
WP92-64/78A - collected by Wolfgang Papsch |
Habitat |
Argentinien
San Luis -
Cerro Carlone, Los Barrancas, near of Quintes
in 600–800 m (1970–2620 ft) altitude
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Description |
named after Hans Borth
gedrückt bis gestreckt kugelig, bis 10 cm hoch, bis 9 cm Ø, einzeln
Rippen je nach Alter 9–16, senkrecht, oft höckrig aufgelöst, Höcker gerundet, ebenso die Kinnvorsprünge
Areolen in 2 cm Abstand, gelblich-graufilzig
meist 5 oder mehr Randdornen, gerade, weißlich bis grau, sehr variabel, am Fuß dunkelgrau bis braun
Mitteldorn fehlend
Blüten 4,8–5,2 cm Ø, trichterförmig, in Scheitelnähe, weiß mit rosa Schlund,
Griffel unten grünlich, mit 10–13 hellgelben Narben
Früchte dunkelgraugrün
Samen feinwarzig, mattschwarz
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Synonyms |
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| CITES |
Anhang II |
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