Caralluma quadrangula (Forssk.) N.E.Br.
Arabian Quadrangular Caralluma
A widely distributed succulent on the Arabian Peninsula, from Yemen and Saudi Arabia to Jordan and the Egyptian Sinai, also known under its synonym 'Boucerosia quadrangula' (Forssk.) Decne. The epithet 'quadrangula' precisely describes the perfect quadrangular cross-section of its stems, one of its most recognisable features. Originally described by Forsskål in the 18th century and relocated by N.E. Brown. Grows on gravels, wadi beds and arid slopes with calcareous or basaltic soils. Flowers are relatively large for the genus, with strongly papillose petals.
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Overview
| Category | Classification |
|---|---|
| Family | Apocynaceae |
| Genus | Caralluma |
| Growth Habit | Erect herbaceous succulent, strongly caespitose, forming large colonies. |
| Conservation Status | Least Concern (LC); wide distribution in Arabia. |
| pH Target | 7.0–8.5 |
| Type | Calcareous, basaltic, stony. |
Origin & Habitat
Requirements
Soil & Substrate
Type
Calcareous, basaltic, stony.
groups Beneficial Associations
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Propagation Strategy
O
T
Every 3–4 years.
Once in spring with cactus fertilizer.
Uses & Applications
Precautions / Toxicity
Contains bitter glycosides; do not ingest without medical prescription.
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"Main synonym: Boucerosia quadrangula (Forssk.) Decne. The species is emblematic for its nearly geometric square-sectioned stems, making it easily identifiable in the field."
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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.