Bergeranthus concavus L.Bolus
Concave bergeranthus
Bergeranthus concavus is a species endemic to the surroundings of Humansdorp in the South African Eastern Cape, described by L. Bolus. Its epithet 'concavus' (concave in Latin) refers to the species' most distinctive feature: the upper leaf surface is markedly concave, forming a longitudinal channel that distinguishes it at a glance from other Bergeranthus. It forms moderately caespitose clumps and produces typical diurnal yellow flowers.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Bergeranthus |
| Growth Habit | Moderately caespitose perennial succulent; leaves with distinctly concave upper surface (longitudinal channel). Diurnal flowering. Active growth in spring, summer and autumn. |
| Conservation Status | Data deficient (DD); very localised distribution around Humansdorp. Possibly vulnerable due to agricultural and urban expansion in that area of the Eastern Cape. |
| pH Target | 6.5–7.5 |
| Type | Sandy, very well-drained |
Origin & Habitat
Morphology
Triangular, fleshy, 3–5 cm long, mid-green. Upper surface markedly concave, forming an evident longitudinal channel (main diagnostic character). Lower surface keeled. Apex acute.
ecoYellow, diurnal, 2.5–3.5 cm in diameter, with numerous linear petals. Flowering in summer-autumn.
ecoModerately sized fibrous root system, adapted to sandy and clayey substrates of the Humansdorp area.
ecoModerately caespitose clump 5–12 cm tall. The concave leaf channel is its most reliable and visually striking identifying feature.
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Requirements
Soil & Substrate
Type
Sandy, very well-drained
groups Beneficial Associations
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Propagation Strategy
- 1 Divide the clump in spring, separating rosettes with roots
- 2 Callous for 1–2 days in a dry, shaded spot
- 3 Plant in mineral substrate and water gently after one week
- 1 Sow in spring on fine sand without covering seeds
- 2 Keep moist at 20–24 °C under transparent film
- 3 Transplant when reaching 2–3 cm tall
T
Watering from above accumulating water in the leaf channel
Every 2–3 years in spring
Very diluted mineral fertilizer once in spring. No fertilizer the rest of the year.
Uses & Applications
Precautions / Toxicity
Non-toxic
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Plant Health
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"The markedly concave upper leaf surface of B. concavus is unusual within the genus and may have adaptive significance: the channel could direct rainwater towards the plant base in the sandy, permeable substrates of Humansdorp, optimising water capture in a semi-arid climate."
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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.