Abstract
The discontinuous distrs. of a number of British flowering plants characteristic of unshaded lowland habitats on base-rich soils are discussed. It is suggested that the localities in which many of these plants now occur represent areas which retained their essential nature (i.e. absence of forest, peat growth or development of leached soil) throughout the Post-glacial forest period due to the operation of natural factors, and that the plants themselves were once more widespread in the Late-glacial period.

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