Faucaria tuberculosa (Rolfe) Schwantes
Warty Tiger Jaws / Pebbled Tiger Jaws
Faucaria tuberculosa, the "warty tiger jaws," is distinguished from its congeners by a leaf surface covered in numerous prominent white tubercles that give it a uniquely rough texture. It is endemic to the South African Eastern Cape and is considered one of the most ornamental Faucaria species because of the contrast between its dark, tuberculate green foliage and large yellow autumn flowers.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Faucaria |
| Growth Habit | Compact, very dense rosette, forming tight clumps; somewhat slower to branch than other Faucaria. |
| Conservation Status | Least Concern (LC); endemic to the Albany Thicket with stable populations but habitat threatened. |
| pH Target | 6.0 – 7.5 |
| Type | Albany Thicket soil with some clay, well-drained; slightly acidic to neutral pH. |
Origin & Habitat
Morphology
Leaves 3–5 cm long, dark green, covered across their entire surface (not just the margin) with prominent white tubercles of varying size. Marginal teeth are 6–10, similar to the rest of the genus, but visually integrated with the surface tubercles, giving a very chaotic, rough appearance.
ecoShort, branched, and partially subterranean; similar to the other genus members.
ecoBright yellow flowers 4–6 cm in diameter; the contrast with the dark, tuberculate foliage makes the flowers particularly visually striking. They bloom in autumn–winter.
ecoFibrous and moderate roots, similar to the rest of the genus; more tolerant of soils with organic matter than Karoo mesembs.
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Requirements
Soil & Substrate
Type
Albany Thicket soil with some clay, well-drained; slightly acidic to neutral pH.
groups Beneficial Associations
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Propagation Strategy
- 1 Harvest seeds from ripe capsules in autumn–winter.
- 2 Surface-sow on fine mineral mix; leave uncovered or cover very lightly.
- 3 Place at 18–22 °C with day/night thermal differential; moisten with fine misting.
- 4 Germination in 10–21 days; leave seedlings in place for 2–3 months before transplanting.
- 1 Remove clump in autumn; separate groups with roots using a scalpel.
- 2 The leaf protuberances (tubercles) are fragile; handle with extreme care.
- 3 Callus for 2–3 days in dry air.
- 4 Establish in very draining substrate; water after one week.
The strongly tuberculate leaf texture is its distinguishing feature; tubercles can be damaged by rough handling.
Watering in summer: winter mesembs like F. tuberculosa are highly susceptible to rot out of season.
Every 2–3 years in autumn. Roots are relatively compact and do not require large pots.
Balanced fertilizer at 50% monthly from October to March. No applications in summer.
Uses & Applications
Precautions / Toxicity
Not toxic; no known dangerous substances. The tubercles are purely morphological structures with no chemical charge.
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"F. tuberculosa's leaf tubercles have no proven chemical defensive function; the most accepted hypothesis is that they are a morphological character of intraspecific identity and possibly contribute to diffusing sunlight across the leaf surface to reduce burns under the intense radiation conditions of the Albany Thicket."
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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.