Abstract
Summary Rhum is a cool, windy island which has a high rainfall. Its ultrabasic soils are mildly acid, have exchangeable Mg/Ca quotients of 1.0–1.5, total nickel concentrations up to 2100 µg g− 1, and have a very high proportion of coarse sand particles. Mg/Ca quotients were higher in extracted soil solutions. A TWINSPAN classification of vegetation data from 283 quadrats on ultrabasic and non-ultrabasic soils produced seven interpreted vegetation Groups on the former soils and five on the latter. The Groups fit more or less into Associations or Communities described by Birse (1980, 1984). The vegetation of the more open ‘debris’ has some rare or uncommon species and is unusual amongst British ultrabasic areas in often having Calluna vulgaris and Molinia caerulea even when the total cover values are less than 5%.
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