Argyroderma ovale L.Bolus
Oval silver stone
Argyroderma ovale is a mesemb endemic to the quartz fields of Namaqualand. Its name refers to the oval or ellipsoid shape of the body formed by its two fused succulent leaves, which is slightly more elongated than in other species in the genus. This morphological trait distinguishes it from more spherical-bodied congeners such as A. delaetii or A. testiculare.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent perennial succulent with an oval to ellipsoid body formed by a pair of succulent leaves. Active growth in autumn-winter; summer dormancy. |
| Conservation Status | Least concern (LC); the quartz fields of Namaqualand are a fragile habitat under pressure from illegal collection and mining. |
| pH Target | 6.5–7.5 |
| Type | Very sandy, extremely well-drained, low in nutrients |
Origin & Habitat
Morphology
Oval to ellipsoid body formed by two fused succulent leaves; more elongated than in other species of the genus. Smooth surface, greyish-silver to greenish.
ecoSolitary flowers emerging from the central cleft; linear petals in yellow, pink, or white tones with central yellow stamens.
ecoThick, deep roots that penetrate the stony substrate; serve as storage organs.
ecoPlant almost buried, with only the upper part visible. The oval body shape is the most distinctive feature of the species.
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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 without covering
- 2 Keep moist under glass at 15–22 °C
- 1 Divide at the start of autumn growth; callous and plant in mineral sand
R
Watering in summer
Every 3–4 years in autumn
Very diluted mineral fertilizer once in autumn; never in summer.
Uses & Applications
Precautions / Toxicity
Non-toxic
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Plant Health
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"The oval body shape of A. ovale is considered an adaptation to more elongated pebbles in its native habitat, reinforcing the hypothesis that lithophytic mimicry in Argyroderma closely follows the morphology of local 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.