• Small-scale variation in topography may favour endemism if it causes species to be persistently isolated • La Palma (Canary Islands) has many deep, steep-sided barrancos, containing unique habitat with many endemic plant species • The proportion of endemic plants on barranco floors decreases with elevation, while the co-linear increase with barranco depth is not significant • Local topography may complicate broader-scale relationships between endemism and elevation, and this requires further research
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