Argyroderma reniforme L.Bolus
Kidney-shaped silver stone
Argyroderma reniforme is a mesemb endemic to the quartz fields of Namaqualand. Its name 'reniforme' (kidney-shaped in Latin) describes the characteristic body profile formed by its two fused succulent leaves, which shows a lateral curvature reminiscent of a kidney shape. This unique morphology distinguishes it from all other species in the genus.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent perennial succulent; body with a reniform or crescent-moon profile. Active growth in autumn-winter; summer dormancy. |
| Conservation Status | Least concern (LC); endemic to the quartz fields of Namaqualand. |
| pH Target | 6.5–7.5 |
| Type | Very sandy, extremely well-drained, low in nutrients |
Origin & Habitat
Morphology
Body with a reniform or slightly crescent-curved profile; two fused succulent leaves with a smooth surface and greyish-silver color. The lateral curvature is the main diagnostic feature.
ecoSolitary flowers in bright yellow, pink, or magenta emerging from the central cleft; numerous linear petals with yellow stamens.
ecoDeep storage root system adapted to the quartz fields of Namaqualand.
ecoPlant flush with the ground with a unique reniform-profile body. Mimicry with curved or irregular pebbles in the habitat is notable.
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Requirements
Soil & Substrate
Type
Very sandy, extremely well-drained, low in nutrients
groups Beneficial Associations
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Propagation Strategy
- 1 Sow in autumn in fine mineral sand; do not cover
- 2 Keep moist under glass at 15–22 °C
- 1 Divide in autumn; callous and plant in mineral sand
S
Watering in summer
Every 3–4 years in autumn
Very diluted mineral once in autumn from year two.
Uses & Applications
Precautions / Toxicity
Non-toxic
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Plant Health
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"The reniform shape of A. reniforme is an extreme example of the morphological plasticity of the genus Argyroderma in response to the shape of habitat pebbles. Its curved profile may reduce lateral mechanical stress from surrounding pebbles."
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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.