Key points are not available for this paper at this time.
A. J. Gray, R. Scott, The Ecology of Morecambe Bay. VII. The Distribution of Puccinellia maritima, Festuca rubra and Agrostis stolonifera in the Salt Marshes, Journal of Applied Ecology, Vol. 14, No. 1 (Apr., 1977), pp. 229-241
Gray et al. (Fri,) studied this question.