Caralluma joannis Maire
Joan's Caralluma
A North African succulent described by René Maire, also known under its combination name Apteranthes joannis. Inhabits arid and semi-arid zones of western Morocco and north-western Algeria, in the Middle Atlas and foothill plains. Its stems are quadrangular, erect, greyish-green with purplish patches, and its five-lobed flowers are yellowish-green to brownish with dark mottling. An attractive species for collections due to its relative hardiness and ornate flowers.
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© Georges Jansoone (JoJan), via Wikimedia Commons
CC BY 3.0
Overview
| Category | Classification |
|---|---|
| Family | Apocynaceae |
| Genus | Caralluma |
| Growth Habit | Clump-forming succulent with erect quadrangular stems; medium habit, up to 25–30 cm in good conditions |
| Conservation Status | Not formally assessed by IUCN; distribution limited to North Africa |
| pH Target | 7.0–8.2 |
| Type | Atlas calcareous-sandy soil, well-drained, neutral to alkaline |
Origin & Habitat
Requirements
Soil & Substrate
Type
Atlas calcareous-sandy soil, well-drained, neutral to alkaline
groups Beneficial Associations
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Propagation Strategy
R
O
Every 2–3 years in spring
Diluted succulent fertiliser once in spring and once in summer
Uses & Applications
Precautions / Toxicity
No documented toxicity; flowers with fetid odour
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"The species circulates in European botanical gardens frequently under the name Apteranthes joannis, the valid combination in the system that elevates Apteranthes to genus rank. The Exotic Garden of Monaco maintains photographically documented specimens that are the most accessible visual reference for the species."
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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.