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The distributions of Primula vulgaris, P. elatior and P. veris in the British Isles are partly dependent on differences in waterlogging and drought tolerance. Comparison of biomass production and root length on soils with different water tables ranked the species in order of increasing waterlogging-tolerance: P. veris
vulgaris>elatior. The habitats of P. vulgaris and P. elatior are recognisably distinct where the species occur together as a consequence of differences in their drought and waterlogging-tolerances. Amongst other factors, the more developed drought tolerance of P. veris enables it to exploit drier, more open, situations.
Oecologia © 1983 Springer