Argyroderma crateriforme (L.Bolus) N.E.Br.
Crater Argyroderma
Argyroderma crateriforme (L.Bolus) N.E.Br. is a mesemb endemic to the quartz fields of the South African Namaqualand and Knersvlakte. Its name 'crateriforme' (crater-shaped) refers to the crater-like or shallow funnel-shaped apical depression on its fused leaves, a distinctive morphological trait within the genus. It grows semi-buried among white quartz pebbles, with which it camouflages effectively.
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
© Paradise Chronicle, Wikimedia Commons
CC BY-SA 4.0
Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent mesemb, solitary or slightly caespitose; body 2–5 cm with a shallow crater-shaped apical depression. Very smooth silvery-grey surface. Active winter growth from October to May. |
| Conservation Status | No formal IUCN assessment; the quartz fields of the Knersvlakte are a hyper-restricted habitat of high conservation value. |
| pH Target | 6.5–7.5 |
| Type | Very sandy or gravelly, extremely well-drained |
Origin & Habitat
Morphology
Ovoid to globose body 2–5 cm with a characteristic shallow crater-shaped apical depression. Extremely smooth silvery-grey surface; well-defined central fissure.
ecoFlowers 2.5–4 cm in diameter, magenta to deep pink, emerging from the central fissure. Very showy in contrast with the silvery body. Autumn–winter blooming.
ecoFibrous and deep roots, adapted to the loose quartzitic substrate of the Knersvlakte.
ecoSilvery and compact plant, with the crater-like apical depression as the key identifying feature. In its natural habitat it is nearly invisible among quartz pebbles.
ecochevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Requirements
Soil & Substrate
Type
Very sandy or gravelly, extremely well-drained
groups Beneficial Associations
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Propagation Strategy
- 1 Sow on surface of very fine quartzitic sand; do not cover seeds
- 2 Mist gently and cover with transparent film
- 3 Keep at 15–22 °C with diffuse light
- 4 Ventilate briefly each day; remove film at 3–4 weeks
- 5 Transplant very carefully at 12–18 months
- 1 Only in autumn
- 2 Clean scalpel; callous 2–3 days
- 3 Pure mineral sand; no watering until activity
T
Watering in summer
Every 3–4 years in autumn
Very diluted mineral fertilizer once a year in autumn
Uses & Applications
Precautions / Toxicity
Non-toxic.
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Plant Health
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
"The crater-shaped apical depression of A. crateriforme is morphologically unique within the genus and probably serves a thermoregulatory function, allowing coastal fog water from the Namaqualand to briefly accumulate in the apical zone during cold nights of the austral winter."
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Scientific Integrity
🟡 MediumVote to help validate this record
Sources
Loading…
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.