Argyroderma productum L.Bolus
Elongated silver stone
Argyroderma productum is a mesemb of the family Aizoaceae distributed in the Little Karoo, near Oudtshoorn, making it unusual within the genus, most of whose species are found in Namaqualand. The epithet 'productum' (elongated in Latin) refers to the more elongated body shape compared to other species. It inhabits quartzitic and calcareous stony soils typical of the Little Karoo.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent perennial succulent with a more elongated body than the genus average; pair of succulent leaves with a somewhat taller profile. Active growth in autumn-winter. |
| Conservation Status | Data deficient; distribution restricted to the Little Karoo, a habitat under agricultural pressure. |
| pH Target | 6.5–7.5 |
| Type | Very sandy, extremely well-drained, low in nutrients |
Origin & Habitat
Morphology
Somewhat more elongated and taller body than in other species; two fused succulent leaves, smooth surface, greyish-green to silvery color.
ecoSolitary flowers in yellow, pink, or white emerging from the central cleft; linear petals and yellow stamens.
ecoDeep roots adapted to mixed quartzitic and calcareous soils of the Little Karoo.
ecoPlant with a slightly more elongated body than its congeners; mimics pebbles of the Little Karoo.
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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 mineral sand; do not cover
- 2 Keep moist under glass at 15–22 °C
- 1 Divide in autumn; callous 2–3 days and plant in mineral sand
W
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 presence of A. productum in the Little Karoo, geographically separated from the Namaqualand core, raises questions about the biogeography of the genus and possible dispersal or vicariance routes along the Cape quartz corridor."
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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.