Boucerosia penicillata Deflers
Brush-tipped Caralluma
A succulent originally described by botanist-explorer Albert Deflers from material collected in Yemen, currently recognised as Caralluma penicillata. The plant inhabits rocky arid areas of Southern Arabia (Yemen). Its stems are erect, tetragonal, greyish-green, and the flowers bear petals with terminal cilia or hairs resembling a brush tip, the feature that gives the species its name (penicillata = brush-shaped). It is one of the least documented carallumas in cultivation outside its region of origin.
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© Krzysztof Ziarnek, Kenraiz (Wikimedia Commons)
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Overview
| Category | Classification |
|---|---|
| Family | Apocynaceae |
| Genus | Boucerosia |
| Growth Habit | Erect succulent; stems 15–35 cm, tetragonal, clustered in compact clumps |
| Conservation Status | Not Evaluated (NE) by IUCN; endemic to areas of Yemen with limited research access |
| pH Target | 7.0–8.5 |
| Type | Pure quartz sand or 80:20 mineral-gravel mix; neutral to alkaline pH |
Origin & Habitat
Requirements
Soil & Substrate
Type
Pure quartz sand or 80:20 mineral-gravel mix; neutral to alkaline pH
groups Beneficial Associations
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Propagation Strategy
G
W
Every 3–4 years, with extreme care not to damage roots
A single very diluted mineral fertiliser application in spring; omit if the plant shows stress
Uses & Applications
Precautions / Toxicity
No formal toxicological data; as a precaution, treat as potentially toxic like other Caralluma species
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Plant Health
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"Albert Deflers (1841–1921) collected this plant during his exploration of Yemen in 1887–1889. It is one of the few Boucerosia described from original field material from Southern Arabia. Its relationship with other Caralluma from the region (such as C. arabica and C. retrospiciens) warrants modern phylogenetic revision."
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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.