Constant species

Agrostis stolonifera, Ranunculus repens.

Physiognomy

The Agrostio-Ranunculetum comprises open or closed vegetation in which a mat of stolons and runners of A. stolonifera and R. repens is the characteristic consistent feature. Throughout the community as a whole, no other species is frequent but there is occasionally some Poa trivialis and Trifolium repens in the ground carpet and scattered shoots or small clumps of Urtica dioica and Cirsium arvense. Senecio vulgaris, Atriplex prostrata and Taraxacum officinale agg. are scarce companions.

Sub-communities

Polygonum hydropiper-Rorippa sylvestris sub-community. The cover of the two community constants tends to be higher here and there are occasionally quite conspicuous shoots of Phalaris arundinacea and Juncus effusus with scattered plants or little patches of Polygonum hydropiper and Rorippa sylvestris springing up among the perennials. Galium palustre, Mentha aquatica, Myosotis scorpioides and Alopecurus geniculatus are occasionally seen.

Poa annua-Polygonum aviculare sub-community: Ranunculetum repentis Knapp 1946 sensu Silverside 1990. Poa annua is a constant and sometimes abundant contributor to the ground carpet in this sub-community with frequent records too for Plantago major, Stellaria media, Polygonum aviculare, P. persicaria and Chamomilla suaveolens. Lolium perenne, Elymus repens, Potentilla anserina and Anagallis arvensis occur occasionally and there are quite often small patches of mosses on bare areas of damp soil: Bryum rubens, Pottia truncata and Dicranella staphylina are the most consistent contributors to this element of the vegetation.