Mercurialis Perennis L. in Ireland

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Abstract
An examination of the status of Mercurialis perennis in Ireland is made, and the conclusion reached that, with the probable exception of the station in Co. Clare, it has everywhere been introduced. Although the plant is aggressive in Britain, it is markedly static in Ireland. The ecology of the plant at various stations in Ireland and England has been studied in an attempt to explain this. At no stage in the life-cycle of the plant is failure found to occur in Ireland and it is suggested that the static nature there is a result of the absence of any suitable agent of dispersal. Evidence is presented in support of this hypothesis.

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