Argyroderma margaretae (Schwantes) N.E.Br.
Margareta's split rock
Argyroderma margaretae is a mesemb endemic to the quartz fields of Namaqualand, near Bitterfontein. It is notable for its pure white flowers, a distinguishing characteristic from other species in the genus which typically flower in yellow, pink, or magenta tones. The body consists of two fused succulent leaves, smooth in surface and pale greyish-green in color.
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent perennial succulent; body formed by 1–2 pairs of globose leaves. Active growth in autumn and winter; total dormancy in summer. |
| Conservation Status | Least concern (LC); endemic to the quartz fields of Namaqualand, a fragile habitat subject to pressure from illegal collection. |
| pH Target | 6.5–7.5 |
| Type | Very sandy, extremely well-drained, low in nutrients |
Origin & Habitat
Morphology
Pair of very succulent leaves, ovoid to subglobose in shape, perfectly smooth surface, pale greyish-green to silvery in color. The central cleft is narrow.
ecoPure white, solitary flowers emerging from the central cleft between the two leaves. Petals are linear and numerous, with yellow stamens at the center. Flowering in autumn-winter.
ecoThick, deep roots adapted to quartzitic substrates; they store water and nutrients for the growing season.
ecoVery compact plant flush with the ground; mimicry with white quartz pebbles is extraordinary. White flowers contrast markedly with the greyish body.
ecochevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Requirements
Soil & Substrate
Type
Very sandy, extremely well-drained, low in nutrients
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 in autumn in fine quartzitic sand without covering seeds
- 2 Keep moist under glass at 15–22 °C
- 3 Ventilate daily; germinates in 1–3 weeks
- 1 Divide in autumn at the start of active growth
- 2 Allow cuts to callous 2–3 days before planting in mineral sand
R
Watering in summer
Every 3–4 years in autumn
Very diluted mineral fertilizer once in autumn from the second year on. Never in summer.
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 white flowering of A. margaretae is unusual within the genus Argyroderma and may be related to adaptations for nocturnal pollinators specific to the Namaqualand ecosystem."
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.