Vegetation Zones of Lesotho: From Alpine Grasslands to Valley Forests

Lesotho—the "Kingdom in the Sky"—is entirely above 1,400 m. Its vegetation mirrors altitude, latitude, and human pressure. Six main zones:

1. Alpine Grasslands (>3,000 m)

• Climate: Cold, dry, high UV, frost year-round.
• Dominants: *Festuca caprina*, *Agrostis lachnantha*, *Helichrysum trilineatum* (everlasting), *Alchemilla* spp.
• Growth form: Cushion plants, rosettes, tussocks — wind/hydrophobic adaptations.

2. Montane Grasslands (1,800–2,500 m)

• Dominants: *Themeda triandra* (red grass), *Tristachya leucothrix*, *Buddleja saligna* (false olive).
• Fire-adapted: Seasonal burns maintain grassland; suppress woody encroachment.
• Grazing: Communal rangelands — cattle, sheep, goats, horses.

3. Subalpine Woodlands (2,500–3,000 m)

• Trees: *Widdringtonia nodiflora* (Mulanje cedar, relict), *Leucosidea sericea* (ouhout / silky-leaved beech) — wind-shaped, multi-stemmed.
• Shrubs: *Erica* spp., *Cliffortia*, *Rhamnus*.
• Transition: Grassland ↔ forest ecotone.

4. Temperate Forests (Lowlands & Valleys, <2,000 m)

• Western/Southern valleys: Deeper soils, more moisture.
• Canopy: *Olea europaea* subsp. *cuspidata* (wild olive), *Podocarpus latifolius* (real yellowwood), *Celtis africana* (white stinkwood), *Kiggelaria africana* (wild peach).
• Understory: *Rhus*, *Maytenus*, ferns, *Asparagus* spp.

5. Scrublands & Thickets (Degraded / Dry Slopes)

• Dominants: *Acacia karroo* (sweet thorn), *Rhus lancea* (karee), *Euclea crispa* (blue guarri), *Diospyros lycioides* (bushveld bluebush).
• Drivers: Overgrazing, fuelwood collection, erosion → woody encroachment / desertification.

6. Wetlands (Mires, Sponges, Vleis)

• High-altitude peatlands: *Sphagnum* bogs (rare, carbon sinks).
• Riverine: *Typha capensis* (bulrush), *Phragmites australis* (common reed), *Carex* spp. (sedges).
• Critical: Water regulation for Senqu/Orange River basin.

Pressures

• Overgrazing (communal tenure, no rotation).
• Erosion (donga/gully formation).
• Invasive: *Rosa rubiginosa* (sweet briar), *Acacia mearnsii* (black wattle).
• Climate change: upward shift of zones, drying wetlands.

Lesotho's vegetation is a **high-altitude archive**—fragile, functional, and foundational to southern Africa's water security.