Argyroderma carinatum L.Bolus
Keeled Argyroderma
Argyroderma carinatum L.Bolus is a mesemb endemic to the Steinkopf region of northern Namaqualand in South Africa. Its specific epithet 'carinatum' (keeled) refers to the prominent keel or ridge on the abaxial face of its leaves, a distinguishing feature compared to other species in the genus. It grows in white quartz fields, where its silvery surface provides effective camouflage among pebbles.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent mesemb, solitary; 2–4 cm body formed by very fleshy opposite leaves with a pronounced ventral keel. Silvery-grey color. Winter grower. |
| Conservation Status | No formal IUCN assessment; habitat restricted to Steinkopf, vulnerable to mining and collection. |
| pH Target | 6.5–7.5 |
| Type | Very sandy or gravelly, extremely well-drained |
Origin & Habitat
Morphology
Very fleshy leaves with a marked keel (carina) on the lower face, giving the body a D-shaped profile when viewed from the side. Smooth silvery-grey surface.
ecoFlowers 2–3 cm, magenta to bright pink, emerging from the central fissure. Autumn blooming.
ecoDeep and robust roots, adapted to loose quartzitic soils.
ecoSmall and compact plant, globular with a ventral keel. Excellent mimicry with the quartz pebbles of its habitat.
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Requirements
Soil & Substrate
Type
Very sandy or gravelly, extremely well-drained
groups Beneficial Associations
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Propagation Strategy
- 1 Sow in fine quartzitic sand in autumn
- 2 Keep moist with mister
- 3 15–22 °C
- 4 Ventilate daily
F
Watering in summer
Every 3–4 years in autumn
Once a year in autumn, very diluted
Uses & Applications
Precautions / Toxicity
Non-toxic.
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Plant Health
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"The ventral keel of A. carinatum is a singular morphological feature within the genus Argyroderma. L.Bolus considered it sufficiently distinct to justify its status as an independent species, though some authors have treated it as a variety of other related Namaqualand species."
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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.