Haworthiopsis viscosa (L.) Gildenh. & Klopper
Sticky Haworthiopsis / Three-Rowed Haworthiopsis
Three-Rowed Haworthiopsis is a distinctive Karoo species recognisable by its leaves arranged in three perfectly aligned rows (tristichous) forming a triangular stem in cross-section. This tristichous arrangement is unique in the genus and was one of the key morphological characters Rowley used to justify its placement in Haworthiopsis.
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Overview
| Category | Classification |
|---|---|
| Family | Asphodelaceae |
| Genus | Haworthiopsis |
| Growth Habit | Subcaulescent; erect stems with tristichous leaves; caespitose with basal offsets. |
| Conservation Status | Least Concern (IUCN). Endemic to the semi-arid Karoo. |
| pH Target | 6.5 – 8.0 |
| Type | Poor sandy-clay, porous; neutral to slightly alkaline pH. |
Origin & Habitat
Morphology
Triangular leaves 3–6 cm arranged in three perfectly aligned rows; surface very rough with dense tubercles on both faces, dark green. The tristichous arrangement creates an unmistakeable geometric visual effect.
ecoErect stem 10–30 cm, triangular in cross-section, densely covered in leaves from the base. Forms colonies through offsets.
ecoInflorescence 20–35 cm; white flowers with green stripes, bilabiate. Spring flowering.
ecoFibrous root system; adapted to compacted rocky Karoo soils.
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Requirements
Soil & Substrate
Type
Poor sandy-clay, porous; neutral to slightly alkaline pH.
groups Beneficial Associations
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Propagation Strategy
- 1 Remove plant from pot in spring or autumn.
- 2 Offsets emerge at the base of the tristichous rosette; detach with a sterile blade.
- 3 Callus for 1–2 days.
- 4 Plant in draining substrate; water lightly after 7 days.
- 1 Select mature leaves from the three rows of the tristichous rosette.
- 2 Remove with a lever motion to retain the base.
- 3 Callus for 3–5 days.
- 4 Place on moist mineral substrate; roots in 8–14 weeks.
The three-ranked (tristichous) arrangement is unique in the genus; protect the leaves to preserve the geometric form.
Watering onto the stacked rosette causing water accumulation between leaves and rot.
Every 2–3 years in spring. The compact stacked pattern fills the pot gradually.
Low-N fertilizer at 50% monthly from March to September. No fertilization in winter.
Uses & Applications
Precautions / Toxicity
Non-toxic or very low toxicity for humans and pets.
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"The tristichous leaf arrangement in H. viscosa, with three rows at 120° from each other, is the only one known in the Asphodelaceae family and has been studied as a model of non-spiral phyllotaxis in monocots. Reclassified from Haworthia to Haworthiopsis in 2013, it is regarded by some authors as the most morphologically divergent species in the genus owing to its unique phyllotaxis."
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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.