Erica arborea
Elgon's slopes support a rich variety of vegetation ranging from montane forest to high open moorland studded with the giant lobelia and groundsel plants. The vegetation varies with altitude. The mountain slopes are covered with olive "Olea hochstetteri" and "Aningueria adolfi-friedericii" wet montane forest. At higher altitudes, this changes to olive and "Podocarpus" gracilior forest, and then a "Podocarpus" and bamboo "Arundinaria alpina" zone. Higher still is a "Hagenia abyssinica" zone and then moorland with heaths "Erica arborea" and "Philippia trimera", tussock grasses such as "Agrostis gracilifolia" and "Festuca pilgeri", herbs such as "Alchemilla", "Helichrysum", "Lobelia", and the giant groundsels "Senecio barbatipes" and "Senecio elgonensis".