Argyroderma speciosum L.Bolus
Showy argyroderma
Argyroderma speciosum is a mesemb of the family Aizoaceae endemic to the quartz fields of Namaqualand, South Africa, described by Louisa Bolus. Its epithet 'speciosum' (showy, spectacular) refers to the notable beauty of its flowers, which are among the largest and most colorful in the genus. This species was prized in 20th-century botany for the size and color of its autumn-winter flowering.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent perennial succulent; body formed by 1–2 pairs of globose to slightly compressed, grey-silvery leaves. Active growth in autumn-winter; summer dormancy. |
| Conservation Status | Data Deficient (DD); distribution restricted to the quartz fields of Namaqualand. |
| pH Target | 6.5–7.5 |
| Type | Very sandy, extremely well-drained, low in nutrients |
Origin & Habitat
Morphology
Two fused succulent leaves, globose, grey-silvery. The body can reach up to 3–4 cm in diameter, among the largest in the genus.
ecoLarge, showy solitary flowers emerging from the cleft in autumn-winter. Long, shiny linear petals in vivid tones from yellow to magenta.
ecoDeep, contractile roots adapted to the sandy substrate of Namaqualand.
ecoStony appearance among quartz pebbles; in flower, the contrast between the silvery body and the striking colorful petals is at its maximum.
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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 very fine mineral sand without covering seeds
- 2 Keep moist under glass at 15–22 °C until germination
- 3 Very sensitive seedlings; ventilate daily
- 1 Divide in autumn at the start of active growth
- 2 Callous 2–3 days; plant in mineral sand
S
Watering in summer
Every 3–4 years in autumn
Very diluted mineral once in autumn from year two. Never in summer.
Uses & Applications
Precautions / Toxicity
Non-toxic
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Plant Health
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"The epithet 'speciosum' given by Louisa Bolus is fully deserved: in flower, A. speciosum produces some of the largest and most colorful flowers in the entire genus Argyroderma. It is one of the lesser-known jewels of the Namaqualand quartz fields."
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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.