Argyroderma patens L.Bolus
Open silver stone
Argyroderma patens is a mesemb of the family Aizoaceae endemic to the quartz fields of Namaqualand, near Springbok. It stands out for its more open or spreading form (patens, meaning 'spreading' in Latin) compared to other species in the genus, with the cleft between the two leaves comparatively wider. Its showy bright pink or intense magenta flowers are among the most striking in the genus.
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© David J. Stang / Wikimedia Commons
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent perennial succulent; leaf pair opens at a wider angle than other Argyroderma species. Active growth in autumn-winter; summer dormancy. |
| Conservation Status | Least concern (LC); the quartz fields of Namaqualand are a fragile habitat. Vulnerable to illegal collection given its showiness. |
| pH Target | 6.5–7.5 |
| Type | Very sandy, extremely well-drained, low in nutrients |
Origin & Habitat
Morphology
Pair of succulent leaves with a more pronounced central cleft than in other species. Smooth surface, greyish-green to silvery color. The opening gives it the appearance of an open mouth.
ecoLarge, very showy flowers in bright pink or intense magenta, with numerous linear petals and a large mass of yellow stamens. Considered among the most spectacular in the genus.
ecoThick, deep roots penetrating cracks in the quartzitic substrate; act as water reserves.
ecoPlant at ground level with an open two-leaf body. The characteristic cleft and pink flowers make this species very recognizable among collectors.
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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 quartzitic sand without covering seeds
- 2 Keep moist under glass at 15–22 °C; germinates in 1–3 weeks
- 3 Gradually reduce watering when seedlings appear
- 1 Divide at the start of the growing period in autumn
- 2 Allow cuts to callous 2–3 days and plant in pure mineral sand
T
Watering in summer
Every 3–4 years in autumn
Very diluted mineral fertilizer once in autumn from the second year. Never in summer.
Uses & Applications
Precautions / Toxicity
Non-toxic
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Plant Health
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"The wider opening of the leaf cleft in A. patens is a key diagnostic character. This morphology is thought to facilitate flower opening under high irradiation conditions, maximizing stamen exposure area to pollinators."
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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.