Antegibbaeum fissoides (Haw.) Schwantes ex C.Weber
Keeled antegibbaeum
Antegibbaeum fissoides is the sole species of its genus and one of the most distinctive succulent plants of the Robertson Karoo in the Western Cape of South Africa. It forms small dense clumps of paired triangular succulent leaves of glaucous green, each bearing a sharp keel on the abaxial surface. It flowers in winter with pink multi-petalled blooms that open during the day — typical mesemb behaviour. Its range is very restricted, making it a fragile endemic of great interest to collectors.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Antegibbaeum |
| Growth Habit | Clump-forming succulent, stemless, producing paired leaf rosettes |
| Conservation Status | Data Deficient (IUCN DD) — endemic to a very restricted area |
| pH Target | 6.5–7.5 |
| Type | Mineral sandy, very well-drained, low in organic matter |
Origin & Habitat
Morphology
Arranged in opposite pairs, triangular in cross-section, 3–5 cm long, glaucous green with a pronounced keel on the lower surface. Soft and waxy texture, no toothed ridges.
ecoSolitary or in groups of 2–3, pink to rose-magenta, 2–3 cm diameter, with numerous narrow petals. Open only during daytime (diurnal). Flowers June to August (austral winter).
ecoAcaulescent or very short, hidden among the basal leaves. With age, brief woody stems up to 2 cm may form.
ecoFibrous, shallow, adapted to thin stony soils. Does not have tuberous storage roots.
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Requirements
Soil & Substrate
Type
Mineral sandy, very well-drained, low in organic matter
groups Beneficial Associations
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Propagation Strategy
- 1 Sow in fine mineral substrate (70% sand) slightly moist.
- 2 Cover with glass paper to retain moisture.
- 3 Germination temperature: 15–20 °C.
- 4 Transplant seedlings after 8–10 weeks.
- 1 Remove the whole clump from the substrate.
- 2 Separate groups of 2–3 leaf pairs with their own roots.
- 3 Allow to callous for 2–3 days in the air.
- 4 Plant in fresh substrate and water after 5 days.
Strictly respect the seasonal cycle: water in autumn and winter, total drought in summer.
Watering in summer, which causes rapid basal rot.
Every 3–4 years or when roots emerge through the drainage hole
Once per growing season (winter) with very diluted cactus fertilizer (25%)
Uses & Applications
Precautions / Toxicity
No toxicity reported; standard caution recommended for non-edible plants
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Plant Health
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"Antegibbaeum fissoides is an extremely localised endemic of the Robertson Karoo. Cultivation requires mimicking the inverted seasonal pattern of the southern hemisphere: watering in winter (October–March in the northern hemisphere), strict drought in summer. Cultivated specimens rarely exceed 10 cm in diameter in a pot, making them perfect for mesemb collections in small spaces."
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Scientific Integrity
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Sources
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Discussion
Disclaimer
This species record is provided for educational and informational purposes only. Jardín Roca Negra does not guarantee the accuracy or completeness of the data. Content is community-curated and may be subject to revision; it should not replace advice from a qualified botanist. This species may be toxic, invasive, or subject to legal restrictions — verify before handling or cultivating. Jardín Roca Negra accepts no liability for any harm arising from reliance on this information. Images are reproduced under Creative Commons or equivalent free licenses; credits are noted below each image.